So, part two is complete after a long and rocky road. I made things really difficult for myself with this piece, partly because I wanted it to be great, and partly because I was really stupid about it. Hopefully this long, long post will help you avoid the mistakes that made this so arduous.
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I had a vague idea of what I wanted with this piece, but as always, I am unable to turn that into a decent thumbnail. Some great illustrators (
Kali and
Meg come to mind) have said they get flashes of imagery in their head and that's how they get to their sketches and then finals. I am the sheer opposite of that, and it takes me a lot of time and a lot of drawing to nail down something decent. Here I'm just exploring troll poses.
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I had a hard time grasping the odd, bulky troll anatomy that I drew out in the concepting stage, so I made a tiny maquette out of polymer clay and moved it around. I did a few gesture drawings off of that to get my hand used to the figure. This was important because I never specified a few thing in the concept stage (how the neck connects, the shape of the back, etc).
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After a lot of thumbnailing, I found something I was pretty pleased with. I'm on a fairly limited timeline with these Hobbit pieces, so I needed to grab onto something quick and then race to the finish. The right page are foliage drawings largely copied from a Charley Harper book. I don't draw a lot of foliage, and so a lot of the shapes are foreign to me. I didn't use a lot of these in the final, but it got my hand and mind used to the concept.
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Here is the final thumbnail that I went with. I was pretty confident that it was going to work out, but it didn't and I wouldn't find that out until several days and a lot of work hours later. If there's one lesson to take away from my idiocy it's this:
ONCE YOU FIND A THUMBNAIL YOU LIKE, KEEP THUMBNAILING UNTIL YOU FIND ONE YOU LOVE. 
Here is the printed, enlarged thumbnail and the first few drawings I did. I'm working in non-photo blue pencil on drafting vellum in these early stages. I was really careful here to figure out how the trolls' muscles worked before I simplified them too much.
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Here are two of those pages. I was a little bummed that my composition didn't give me a chance to show the trolls' tails, because I really liked them.
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Here are the trolls together for the first time.
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I drew the background fairly spontaneously this first time, just placing different types of foliage helter skelter throughout the image. This isn't really the way I usually work, and it felt wrong.
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Another version of the previous drawing, with things planned out a bit more. I had a tough time placing the crow, which you'll remember belongs to one of the dwarves in the previous piece. It's not a detail included in the book, but I thought it added some personality.
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I moved the bird to the bottom and straightened out the one trolls' arm, since
Brian said it looked like they were doing something tawdry.
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At this point I've blown up and printed the previous drawing to the size I'm going to be working for the final.
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I decided to draw the background and the trolls separately so that the digital image would be a little easier to handle.
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Here is the first drawing of the background, at a final stage. Too complicated!
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I was much happier with this simplified background, even though I was still making a lot of mistakes. Something that I should have considered was the reason I was working this large. I didn't blow up the sketch so that I could pump a lot of miniscule detail into it, I blew up the sketch so that I could draw larger. This is a mistake I will continue to make through this piece.
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The first troll, which I was pretty happy with. Unfortunately, I forgot that I was going to give them craggy gross elbows, so I had to do it again.
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Luckily this drawing was better than the first one. I could have just drawn the elbow and pasted it onto the first drawing in Photoshop, but I think redrawing things is good for you. It almost always shows you different, better avenues.
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This troll's face is one of my favorite drawings I've ever done.
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I was very happy with the second and third trolls, and they'll stay the same through the final.
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Alright, this is a big change. I had already taken the previous final drawing into the computer and did flats for it. I was basically ready to go, but something was still nagging me. It lacked focus and it lacked gesture. It was too full of compositional tricks that I used to try and hold it together. I drew and pieced this new comp digitally and printed it.
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Here I'm working on the new background on rag marker paper, which is semi translucent and extremely tough. I tape it down to a board over a heavy piece of hot press arches watercolor paper. I have a ton of paper scraps left over from other pieces, and I use the watercolor paper as a soft backing for the thin marker paper. This generally lets me get good darks from my pencils and keeps me from breaking lead as often as I would otherwise.
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Here is the final background drawing, which I was very happy with.
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Aaaand here is the desk that I work on, laden with all of the drawings from this piece.
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I explained the reason for doing flats in the last process post, and it's the same here. It cuts down on file size and makes managing multiple objects easier.
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At this point I was really struggling to figure out what colors I wanted to use in the final. I knew it was going to be largely green and gray, but I didn't have a solid idea for what colors the trolls would be. I liked them as red and orange, but Kali pointed out that having them blend in with the background would be more logical and end up looking better.
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Since this scene takes place just as dawn breaks, the lighting had to be very specific or else the impact would be lessened. I tried these colors with the sky as red, gold, yellow, pink, and finally this yellow-green. Yellow-green isn't the most obvious color for dawn, but I think it gives the forest a little more creepy atmosphere. I try to do as much lighting by just choosing the correct flat colors before I begin to add shadow or highlights to anything.
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Because I set up flats for this image, I was able to do the modeling and rendering entirely on one layer without any hassle. Again, I use a lot of custom brushes in Photoshop made from paint and ink and pencil and concentrate mostly on color variation rather than exact realistic rendering.
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I went around the image and added a layer of multicolored lines on the environment's surface. This added just a little layer of depth and texture which is easy to overlook but helped further the atmosphere.
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Like in the previous piece, I added an overall layer of shadow by setting a layer to Multiply and painting in a light purple color. This helps add direction and color to the lighting.
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A couple of small color adjustment layers were added, as well as a layer of graphite texture and a layer of ink texture. Just more subtle tweaks. I also added a pencil texture to the bark of the main tree and subtle striping to the trolls.
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Here are the lines laid in and colored.
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I added the vine in the foreground and some falling leaves. I needed the foreground vine to break up that heavy black space, and the falling leaves add a little bit of warmth to the blueish green foreground elements.
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Some final tweaks to the lighting and we're just about done.
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And that's that. Here is a slightly larger version of the final for you folks to investigate.
The final image is approximately 11x16 inches, pencil, ink, and digital.