hey
I think some things I'm about to say have already been mentioned.
Anyhows I think his head/neck look a bit stiff, and I see no great movement in his torso or jacket. Shouldn't he turn/sway from side to side a bit? and if you really want to get into detail, maybe you could add some slight breathing motion or whatever. I don't understand the shoes, looks to me somewhat like he is wearing shiny socks and slippers or something, and his right hand looks a bit odd to me. Finally I think his hat looks quite small, and his neck is rather bright, as I think some shadow should cast over it.
Hmm, I think that's it for now.
cyas