Looks pretty cool for!! Love the way you choose your scenes / scenarios ... that is pure art
I would consider overriding all materials to the clay one and focusing on a light / shadow .. .as currently it feels like it's lit up pretty evenly .. which is fine .. but it might get a lot more character if that would a have story told by light ..
I'm not interior designer here, but here is my 20 cents .. I think that there is too much roughness screen wise .. and everything is pretty busy .. as you know our eye needs a wresting place .. something less rough, simple, smooth .. empty (i.e.) .. the obvious solution would be to make the wall a bit less detailed ... and also the ceiling (maybe it will be darkened after lighting set up)
Also feels like the scene ends on the left side right outside the camera frustum .. I would, maybe, put a piece of something to give it a feeling that there is actually the rest of the room is behind the camera.
Also maybe you would want to separate a bit the background and a foreground .. via light, or shadow, or DOF ... just to give it a bit more of the air perspective.
P.S. - maybe a bit of dust / god rays would give a bit more character ..