Volatile Redux

Seriously dude, this is a class piece. The only bits of criticism that I think are relevant to this piece is using the Needler rounds and the posture of the Brute. In the games, the rounds leave a long pink trail, and are fairly thick. Unless you really feel that you can pull off the effect in other pieces, you might want to stay away from it. In your other piece, "Alien Versus Halo" the plasma streak is perfectly done.
The second thing that I mentioned was the posture of the Brute. He looks a little distorted.
All in all, great piece. The Chief on the Ghost wreckage makes for an epic piece. But then again, I guess the Master Chief's face on anything would increase the sales of it by a few hundred percent!