the scene is really great, very good work! 
i like it a lot but, some critique, before you spend a pretty much cpu time with final 
rendering... the fluorescent lights on the ceiling, they are too simple, you should make 
some sort of protection to them, some wire or .. i don't know the words, sorry, but i think 
you understand, than again with lights, inside the holder, there should be something 
reflective, metal mirror, light like this would be useless in reality.. (add some bloom on final 
render 

 ). i see wet on the floor, but only on some parts (the isolated squares), add some
 weak bump and try to make "wet" a bit squares around too. btw, more bumpmaps 
everywhere, sometimes looks clean but the texture is not, or it looks too clean to be true. 
a last finish one thought.. on the clock i read 11:55 and i guess am 

, the sum in the 
topmost position, but the light from outside does not look like, yeah, maybe it is cloudy, 
maybe it is surrounded by high buildings, but would be nice to have a bit direct sunlight on 
the stairs, just from artistic reasons, but this is not so easy to achieve with exit portals. 
only if you model some extension above the stairs with portal on top and with some pieces
 of mesh which will modulate the light.. ahh, one more thing, i really like the reflection of 
stairs in train window.. 
that's all  
PS: apologize my bad english