Focusing on either (1) the drain and surrounding bricks or (2) the blocked fire exit might have resulted in some interesting images. But as currently presented this isn't a particularly interesting scene.
I like the image. It possibly could use some dodging and burning and perhaps some more litter (to be picked up after the shot of course) and a touch more contrast.
I'm not sure whether this is terribly sophisticated or just very simplistic. Isn't 'dumpsters' a rather american term for a UK scene? (joke). I think this could do with more contrast work - darken those shadows some: after all, you already have a dirty non-pretty scene, why not go the whole bit and give it some real sense of grime?