The scene looks pretty good Dan,Things i would recommend will be, To improve on the normal maps and polish some more in the diffuse. Show damages in the walls and/or in the floor. Add an AO pass,as some one mentioned. Opt for a better lighting solution or bake the lightmaps to the assets.…
Looks pretty good, although it seems like everything you haven't photosourced directly (mainly the duck and bucket textures) look like they're made of concrete. They should be smooth surfaces, don't add noise & bumpiness to everything without regard to what sort of material it's meant to be. The bucket should be smoother…