Looks cool. Detail work isn't too bad and the composition is cool. You've got some problems with distance perspective, though - things tend to get lighter as they get farther away, not darker, with some exceptions. Additionally, objects far away will lose detail, which is in saturation, contrast, and complexity. Additionally, there's some slight readability issues about the forest in the background, but this is because it's typical for landscape pieces to have parts of the sky showing - you've mostly obscured it with clouds.
This obscuring can be accounted for by showing that the sky extends up and out off-canvas, but the way that you've placed the broken, floating building pieces is in a straight line going down, perspective-wise, which confuses the mind (as the brain wants to think that the pieces are all on the same level above the ground, which clashes with the perspective of the horizon). Things to think about.
Very cool piece. I love the texture in the bricks, and all of the little buildings in the distance.
ty ^_^