That material is probably the citadel material from HL2, looks similar. Kinda metallic, VERY reflective.
I like the main room, but now that you have the detail in terms of props you need to add some visual breakup, by that I mean decals.
Place decals at the base of the computer consoles, maybe even raise the floor a touch (2px - 3px) as kinda like a mat or a floor covering. Arrow decals, exit signs, stuff like that, some grunge where the chairs are and would have been rolling around.