It’s a nice start, but there are some things about it that are too CG.
I see that you have avoided the sharp corners, but have failed to see that it’s very rare that two things are exactly the same size (i.e. you have duplicated and not varied very slightly).
There’s also a very de-saturated look to everything. Black is rarely black (or even 0,0,0). and white is rarely white (or 255,255,255). There is always going to be something out of sync in the RGB channels. Even if you are going for a B/W render, you need that 255,255,245 or whatever to get the shading right.
EDIT: Oh, and what’s that weird oval shadow in the hall?