Paint the walls a pure shade of grey or white, it will save you headache in the long run. It depends a bit on your lighting what is the best colour. If you are using shoot through umbrellas you may want grey walls to be able to shape the light as you want but otherwise white will work. If you want to put colour on the walls in the bedroom just add gels to your lights, it’s not like you are going to be using the light bulb in the ceiling anyway. The only colour I’d consider would be a pale yellow but only in the bedroom. If you can get 18% without any colour cast and a colour that won’t take on a hue over time that would be easy to work with without being too dark. White on the other hand will have the advantage of making the space look bigger and more modern which is not to be sniffed at.