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1. Needs more attention to the volume. Treat the form as a round thing in space; don't trust the flat page. Perspective is good for you.
2. Needs directional lighting. Needs it bad.
3. Most of the problems with this picture cannot be solved without repainting large portions of it. It pays to solve the fundamental problems at the sketch stage, not as an afterthought.
I'm assuming this is meant to be the cook, but to me he's reading more as an alchemist - those don't look like food, they look like potions. (The pans on his belt, as well as the thing on his back and a lot of the jars, all have perspective issues.)
His pose could use some work, too, it's kind of boring in spots (feet) and awkward in others (relation of head to shoulders/ tilt of upper body).
Looks good. I must say that of all the entries to this contest I've seen posted here, this one hits the mark most closely--in terms of style and content it really fits perfectly into the D & D universe.
That said: all the previous posters make some good points--although I wouldn't worry about adding a strong directional light. In my opinion the forms read very clearly already.