Hi,
I agree with Oliver, see the spots I marked:
I expected those to be darker, the scene seems to be over illumintated. It looks like you are using emitters on all the doors and windows. You have over exposure on the top door but you also have strong specullar on the cabinet bottom right, facing the opposite side.
The shadow from the mezanine on the right white pannel gets me confused... sun also?
Anyway, so much light from every side flatens the picture. Try balancing the emitters, something like strong ones from north, dimmer ones from south or something like that. Bring down the reflectances also, this should darken those corners.
Ricardo