just curious because of the "staircase effect" from lighting on the dark hallway you have.....are you using light_entities or texture lighting?
the ambience of the place is really nice man(brushwork is good)....but,i get quickly unsatisfied when i see HL textures. please dont let that get to you, its just my personal mapping pet pieve ! i know your connect is bad so you dont get all the good wads out there
unfortunate..i wont say anything again about the HL textures i promise
I see a lot of cool potential in what you are doing.
another small thing in pic #4:
the rusted railing doesnt really fit the "clean" grey all around it. if the other textures had a rusted feeling to them then id say thats fine.....
just think about it (its good to have contrast anyway).