this looks very good.  The one thing that my very uneducated eye seems to catch is that his torso seems a little thin in relation to his arms and legs.  looking up from the feet and following the figure up I'm expecting those legs to give way to a more (i dont know the word to use) rugged, or solid torso.  I'm not quite sure how to explain this better (though I think my initial explaination sucked!)  Its almost like the torso belongs to a very athletic smaller framed fellow.  Where the arms and legs remind me more of a, still athletic, tall, braod shouldered kind of guy.

Just some basic impressions.  

Good work!