looks pretty cool, but the way he holds his gun is unrealistic.
the gun seems to be a larger caliber so if he pulls the trigger he would knock out himself 'cause the gun will hit his head

Take a look at this video (around 1:00):
http://www.youtube.com/watch?feature=player_detailpage&v=L1cMaNXP9sg#t=65s

Maybe you can change the way he holds the gun, would definitly be better than now