His expressiion is too soft. Not enough rage/adrenaline/stress. He looks so... casual.
The helicopter kind of looks like an afterthought. The propellors have no sense of motion (unless they would be animated in the game)
It looks more like a TV copter than a war one, which I think would be more fitting for this image.
Something like an Apache maybe.
Aside from that, this is turning out nicely.
The shirt could use more contrast.