Lets get one thing straight, this picture is among your best. With that out of the way, my criticism is that the shin that he is resting his arm on appears a little short in relation to his other one. That should be an easy fix however. His guns look a little too much like grave's from gungrave [link] , perhaps a moderate redesign to them is in order. I hope this helps.
PS: im sorry for not getting in touch with you, life has been really freakin hectic as of late. Maybe we could hang this weekend, get back to me on that.