Beginner asking for some help.

[daortir]

Hello again everyone !
Since I'm kinda done with my script questions for now, I'd like to get some help on the CS itself, the lighting/atmosphere and stuff : ).

Here are two screenshots of the levels I built so far, would you please look at it and tell me what you think I can improve ?

Spoiler below!

This level is within a dream, after a very short level in the storage that I didn't build yet. Or actually i accidentally deleted half of it. Anyway, here's what the dream/hallucination looks like :


This is just a random view of the mansion, I choose this angle so you guys can see the lighting. I still have to work on my lamp lighting but I'll post screens later ^^.