This is good, there's no denying that. Since you requested critique, however, I'm going to nitpick. The poses of the soldier in the middle and the one on the left look a little stiff. You should give them a bit more body language and make their poses a bit more dynamic. Also, the one in the middle looks off balance, especially if you consider how much the stuff on his back looks like it would weigh, know what I mean? Lastly, while i can see light affecting the far side of the soldiers, right here in our face, bottom center of the page, is a huge flame that seems to be causing very little illumination on the soldiers (especially the one in the middle). Although it's not as big as the explosion in the background, it's still pretty big and more importantly it's much closer than the one in the background so it should be casting a much stronger light on our heroes.
Like I said, I really like this image. My comments are only suggestions to help you improve your already impressive skills.