You might want to try adding a bit of bump depth to some of the objects, for instance the wall and the ground should look a little deeper if you get my drift. Another thing to play with is the lighting, it looks like the sun is off to the right but everything is very bright looking at it from this angle, lower the lighting from the front angle a bit.

Just some suggestions...looks pretty good now, working on the small details can only make it look better

Darkon