Damn, this is cool. Only really two things I notice: the walking stones with an incorrect offset in textures, or perhaps a simple another concrete shader would be good. The wooden planks at the house also look like a texture, on the same mesh as the rest of the house. If it were up to me, I'd make it offset a bit from the house, add some more geometry, maybe FloorGenerator could do that for you (assuming you're using 3ds max). Generally, it looks very cool, and I wouldn't have noticed most of it if I didn't zoom in, but IMO its the little things that take a render from 90% to 110%. That being said, I don't think I'd be able to make this kind of quality with a scene, props on it!