Alight, this is my first critique.
Vision: You have made so much stuff going on at once, but at the same time I can tell everything that is going on. Good Job dude.
Originality: Sorry about this one, I've seen plenty of Warhammer 40k pics that do this, yours is the best so far though.
Technique: Like I said in vision, you have so much going on and I can tell everything thats going on. I love your shading and your smoke effects, the gunfire is also awesome.
Impact: Your picture slapped me in the face when I saw it. I nont think I can say much else. It slaps people in the face.
You sir, have earned a watcher.