The only I'd "correct" about this picture is the hand that holds the gun. The fingers seem too symetrical, and aligned for that angle... If you know what I (try to, at least) mean... :S
And I'd not put the elbow in that position... but that's more subjective, I guess..
Oh.... that makes a lot of sense... u^_^ I must admit I thought of that possibility. But if those aren't his fingers.... how is he holding the gun? (don't need to answer that.. hehe... just wanted to see if I can get what you originally drew. Maybe it was right, but I just can't see it... u^^ )
Well...he's holding it below the...uhh...magazine...and the gun is...umm...magnetic! Yeah, and clings to his armor! That's it!
Nah, didn't give it much thought really. Figured as long as the hand is not visible, it would be ok.