Looks nice so far!

The rocks (walls) are way too flat. Use displacements for them. The map is too dark at places. Lighten up the floors so people see where they go even if the sun mirrors on the monitor. There is some texturing that needs to be refined.

The stairs in this pic for exmple need a proper stair texture. The neon lamp models seem to have a bad skin. They look like they are off although they emit light. Try using a different skin number (1?) or a different model where the lamp looks like it's on.

The last shot is probably my favourite. Looks very atmospheric and the floor is lit bright enough!