It looks odd to me that the cords that are holding the platform have some slack in them. Shouldn't they be completely taut because of all the weight they're holding? It also seems odd that there is a track, something that is completely rigid, leading to a platform suspended in such a was that it could sway (in the real world).
You have a window placed right on a gap in the wall, which makes it look like the window is put on the wall like a poster, rather than looking like it goes through the wall. If you scroll the texture on the wall so that the gap is behind the sign, it would look better. Likewise, I don't like the gap right against the doorway.
Fixing these things would help make it look like a real place.
Remember, I am not picking it apart to be mean. I am trying to help.