A nice matte grey would look good behind the couch, just to add some contrast.

Agreeable Gray by Sherwin Williams is an amazing greige color. We ended up doing Shady by Dun Edwards as our painter used that paint brand but it is an exact match. The house looks A-mazing! Or any of the deeper greige shades such as Perfect Greige, etc.

I would go with a steel blue from one of your textiles or beige two shades darker from what you have now.

I don't see where there is an architectural break on the wall behind the sofa. Would you be good with the accent wall continuing into the next room, as you can't paint 1/2 the wall one color and the other half something else.

I like the camel celerygirl did.

What are those dots on everything? Is this your actual room?

I do not think it is her room.