Disjointedness
This picture has the "scope" problem that all my illustrations have ever had. If you look at a small box, everything is always in perfect proportion, but if you zoom out and examine the picture as whole, there are proportion problems. The head seems too big and pushed too far to the right, even though the face is *incredibly* lifelike. The two shoulders seem to be at different heights, but I'm a big fan of how you shaded them. Finally, the hand looks excellently detailed but it's much too big compared to the rest of the body (even the head). Now, it almost looks like this disjointedness is deliberate, and if so I say "Woot!" Otherwise, the picture looks like an agglomerate of smaller, well-proportioned pieces that are poorly combined into a single scale.