A couple of comments. First off, the light is in the wrong position. There should be a little more of it on the top. Otherwise part of the hole is somehow blocking the light with its vast emptiness. (Specifically, the indentation closest to the viewer. Based on the angle of the lighting elsewhere, there should be some visible light from that too.) Next, why isn't there debris on the floow from where the cieling caved in? No matter how hard it rained, if the rest of the building is still in that kind of condition, the debris would still be there. Also, the comment regarding the stairs has relevance. They look fairly new, as if some construction worker came by and put in a new set but left the rest of it as-is. Finally, where are the bars next to the starts. Pretty much every building code worldwide requires that, and last I checked, those weren't very likely to disappear without a trace and leave the rest of the building as is. (Kinda like the rubble from the collapse, huh?) I can see where they were supposed to have been, but regulations would have also required them in the middle of that staircase, where there would certainly be holes in the ground if they had been removed.
Also, please take these comments with a grain of salt. I'm a perfectionist, which is why I don't try my hand at art. I'm too nitpicky to go through the learning process. In reality, this is much better than I can really hope to accomplish without a great deal of hard work and determination. (And a great deal of cursing at myself, because I just can't really translate what I see to the finised product.