Ok, you asked for it...

There are a few things that bother me, here. Remarkably, the least of these are the feet. Honestly, the only issue I have with the feet is to ask whether he's wearing boots or sneakers. If it's boots, they look a little too much like sneakers, and if it's sneakers, then there wouldn't be a heel on 'em.
The numero uno problem that I have is the arm in the foreground. All total, you have the shoulder and the hand in essentially the right place, it's just that there is too much arm in between. Seriously. Drop your arm to your side and see where the elbow actually hits. It should fall roughly at just about the bottom of your ribcage. Now look at where his would hit were he to drop that arm. The second arm needs a little "beefing" in order to make the foreshortening work, too. You could probably get away with showing a little bit more of the upper arm behind him and have it still "feel" like a natural pose. It's probably one of those instances where you have to fudge the artwork just a little bit, even if the photo doesn't show that at all.
Next thing is the hand that is supporting the barrel of the gun. You need to turn it just a little bit to expose more of the side of the hand, because at the moment, by just seeing the thumb, we get the impression he's taking double jointed to new and exquisitely painful levels.
I suppose my only other question whether or not his torso is really that long, or is he wearing those god forsaken baggy jeans that shows miles upon miles of underwear?
Don't take any of this too harshly- I think you've got an excellent start there, and there are a lot of things that work. It's just that the few things that don't work are throwing me off.