Not bad. My only gripe is the centered composition. I think it would have been a lot more powerful had you gotten lower and framed him in the bottom left with more open area to the top and right.
EDIT:
I chopped up your shot a bit, moved some stuff around, and made a few tweaks like minor curves and color balance. This is more of what I was talking about. Keep in mind it was a 5-minute chop job, so I didn't clean it up or anything.
