Holy mother of Armageddons, spectacular!

I think it would be really cool if we could see some more land through the clouds, as of right now. It looks a bit weird with all those clouds so thick together.

And I think you could've detailed the nearest fireballs that are falling down, with fragments of flames and debris coming from them, and not just the tiny particles, but something bigger.
The fireballs that are in the far back, could've been blurred a tiny bit too, as they look to sharp.

And some sweet touches with the spaceman helmet and the rocket coming down, they really add a sense of life in this scene, and they add a lot to the scene.
This picture really got the "Wow" factor to it, great work and quite epic.