The clipping/shadow error with the teeth, or whatever it is, really stands out.
The BB is damn fun to use.
Odd picture composition though. Would have made more sense if the heavy was walking toward the middle of the picture, rather than off to the side.
I like the gentle mood created by the subtle lighting; it goes very well in contrast with the facial expressions. I also like the blur that was used on the barrel of the gun. I think the only thing I would amend would be the little black thing in his teeth, but its still really great without it. I like it a lot!