Actually it looks like you have some pretty good structure going on here, I love the musculature and the wrists especially, but one thing I could see being a hinderance (although I can't speak officially on behalf of artspots) is lighting and atmosphere. Its a good character, no doubt, but there's nothing really drawing the viewer in. The lighting on the character seems to come from all directions instead of one (or two) defined sources. Maybe to go along with your cool characters play around with some settings (even just basic background elements, we're not talking huge epic murals here) and maybe some cool lighting, maybe even some different angles?
Just hoping to help a little :)
