Excellent picture, the facial expression is really accurate, assuming the guardsman is in a situation where there is much need for some anger. The weapon, apparently, is a las weapon, but I would have guessed it to be an autoshotgun, since it looks a bit like that, if you have happened to see that kind of weapon... the respirator unit on the guardsman's neck is exceptionally well-made.
Quite the badass, and that lasgun is just ballsy. I especially love the insignia on his shoulder, looks sweet, I assume its of your own design. And he has quite the rage face. As usual great guardsman art.