I think this is brilliantly drawn, textured and colored, congrats. Alas, there are a couple of not-so minor things that are bothering me: the foreshortening (perspective) on the arms. Here are some suggestions to fixing it, should you choose to:
Your

v1

v2

Since his arms are lifted, it's impossible for the arm with the "gun-hand" to be in front of the other, since the higher arm's elbow would block the gun-hand arm from twisting into that position that you have in your version.
In v1, i placed the higher elevated arm in front of the other, solving that. The hand for the right arm should also be twisted so that the thumb is away from the observer, not with the back of the hand facing us (this would be possibly the most simple correction for you to do). I also corrected the perspective for his coat/armor on the right shoulder, and added volume on the left one so that the elbow bone doesn't stick out of the arm.
In v2, i made the gun arm turn towards us, so that they wouldn't cross (impossibly) over his chest. I had to change the perspective on the gun muzzle (adding more smoke/plasma coming from the gun), and changed muscle shading on the forearm to reflect the perspective change. The edits on the arms and shoulders follow the same idea from v1, and the hand should also be edited to be closer to v1 (didn't edit it on this one).