Colouring Gary's living room

This is the first rough sketch that I created for the living room shot.

This image is close to the final design that I will use. As you can see, the basics of the shot have remained the same as in the rough sketch. The only improvements I hope to make are in the colours. I admit choosing colours isn't my strong point, and hope to get helpful criticism from others to improve it.

EDIT: This is the final design that I chose to use for the living room. The main changes were with the colours, the thickness of certain lines and getting rid of the black outlines, which I think has improved the look of the background completely. I also redid the outlines of the rug to give it a more natural look.