The couch started wtih a polygon cube, which I extruded in to two arms and a backrest. It was then converted to sub-divs. I then made cushions out of a poly cube, converted to sub-divs, and covered them in cloth to give them a more, leathery look. I think they are the best part of the scene.
For the light I put a pointlight in the lamp, and added an ambient light to lighten up the shadows.
Please tell me what I can do to improve my room.

(PS. The white part in the bottom right is where the other wall would go, just ignore that)