Looks awesome. Could probably use a stronger normal map on the walls and ceilings to catch the light better - they look a little too flat/perfect. How about a decal or two for things like wall outlets and switches?
Just one small advice since you're using it for the demonstration of the scene. If you don't want to turn on AA, when you grab your screenshots you could use TiledShot command (open console then type in "tiledshot 3" for example). After you've taken the screenshot just resize it down and it will smooth out those jagged edges. Typing in 3 in the command means you'll grab 3x3 of the regular screenshot size, so in that case you would be scaling it down to 33%.
To use tiledshot command you'll just need to remove the weapon (under World Properties/WorldInfo/ check "no default inventory for the player") and the hud (you can just type in "showhud" command). It will make those pics look much better.
imho it looks too flat. more dramatic lighting would be nice, contrast between shadows and highlighted areas, GI feeling. the materials look like they have basic flat color in the diffuse slot and thats it. also antialiasing makes magic