If you can't clean up the painted edge, you could always add a 1x3 piece of wood as molding. You can even carry it up to the ceiling to frame that wallpaper. I don't see that paint color in the wallpaper, or maybe it's a lighter version of the flower centers. Maybe stencil on a design using the darker color, or another color from the wallpaper to help tie it together. Then narrow floating shelves or vertical frames or something in the painted areas it you feel you need it. Maybe turn the bed around so the wallpaper is the headboard.

If you love that wallpaper, use it in bathroom. Not really right for behind bed. I would go a drum style chandelier. In a silk pale gold. Your bed looks zen or Asian to me. I love it. But, you don't. Need to much with it. Keep it simple a more formal drape on windows, color would depend on wall color and bedding. I'm thinking a dramatic peacock satin. Use a lighter same tone on walls a rich teal. Ceiling can be gold leaf. With alight that cast shadows on ceiling at night. Then your wall paper will tie in. Furn should be mirrored.

I think grays and blues would look great! here are a few accents that may go with your yellow color. I also think that if there are a few pops of bright yellow you would be ok! http://deciture.com/antique-styled-floral-wood-metal-wall-decor-3-assorted/ http://deciture.com/artistic-styled-metal-wall-decor-assorted/ http://deciture.com/attractive-styled-metal-flower-wall-decor/ http://deciture.com/peacock-in-print-wall-decor/

See you need to fill it with colourful stuff. First thing u can change the ceiling fan. You can get latest designer one's. False ceiling appears to be done. If you want to continue with same sofa try to make over with that suits your taste. You can have wall decor/painting and Center table can be changed I think anyways happy searching The