I'd like to show him with that type of strength that comes from manual labor rather than weight-lifting, with a solid core and sinewy, corded muscles in the limbs. The first drawing on the left is too ape-like, too stupid. I like the one on the right. Let's see where it goes.
Beorn's long, low house is surrounded by hives filled with bees bigger than your thumb, which of course beings to mind one of the ultimate horrors of this world, the Japanese Hornet. Learn more about these living nightmares here. I don't know if the final piece will include them in any, but now's as good a time as ever to get good at drawing hornets.