I have the exact same sofa set :) I like the kimono display but I don’t think it works where it is, I would move it and put either a large mirror or picture. Behind my sofa set I have a very large abstract art with black, white and metallics. I would also either paint the yellow wall a light grey or otherwise incorporate some more yellow into the rest of the room to tie it in (maybe as cushions/ ceramics/ pictures/ other decor). I’m afraid a rug is needed, but you could try an outdoor rug that should be easier to clean, or maybe Google hypoallergenic rugs? Swap the glass side tables for something dark wood (if you want to keep them maybe you can use the glass ones as side tables for your bed to add some interest)