The city itself, and the background, are fine. The distant background looks really apocalyptic, not bad at all.

The issue is with the meteors. For one, there's little to not blending. They look dropped on. Especially the one hitting the ground, there should be debris between the viewer and the meteor.

The BIG issue though, is lighting. A flaming meteor is going to create -a lot- of light, especially on impact. The entire city should have a rather prominent orange/yellow glow.