I agree with everything @Lydia Chase says. It would benefit greatly from the addition of atmosphere. I feel that it's lacking a clear focal point. What are I supposed to be looking at? Everything is beautifully rendered but as a viewer I want some kind of narrative. The addition of a character looking over the rubble would be amazing. Regardless of my opinion though. What you have is really awesome! Keep it up!

Hi! I really like the direction this is heading, your handle on light and shadow make this piece fascinating to look at. I think by pushing the lighting and atmosphere, almost exaggerating, could help the composition and design. Regarding the composition, I think defining the edge between the foreground and background would be helpful. Maybe adding more atmosphere between the viewer and the town in the background could create contrast between the foreground, and would add to the vastness of the town. Adding some high saturation highlights on the slabs of stone in the sunlight would make the foreground sparkle and glow! I hope those ideas help!