Thanks. I was particularly pleased myself with how the hair came out.
The issue with the torso is that I was going for a little bit of an angle looking down on him down to the waist - perhaps a little evident in the angle of his head against his shoulders - which would explain its squat look. I did actually mean to put some heavier shadows below his chest for that reason to try and emphasize that. I don't know if it will really help very much, as I'm inexperienced with interesting angles as it is, but it's not hard to do, anyway.
Thanks very much for your helpful comments. I see the problem with the collarbone now.
Wonderful action and detail. The attention you paid to the hair and the lacing in the clothing is really nice :).
There are some anatomical errors, which I wouldn't point out as its obvious you're going for a more stylized approach, but I think they take away from the fluidity of the piece. The major one is his torso, which is about one head-length too short (it makes his legs look like they're growing out of his waist). Also, you've made his collar bones growing into the fronts of his shoulders, they should slope upward and connect at the top, just shy of where the tops of the arm bones connect.
Other than that I think this is a great piece. I'll look forward to seeing it with the background you've been thinking about ^^