Hi sunnyshama25. I recommend dark walls (matte finish) for your dedicated theatre room. The reason is so light doesn't bounce around the walls; you will enjoy a better theatre experience. My family's previous home's theatre room had three white walls and only one dark wall. We regretted not painting all walls dark. We did have heavy drapes and pelmets for the large windows in the room to reduce light as much as possible. The floor was thickly carpeted in a dark colour (for acoustics and to reduce light reflection). In designing our current home's theatre room, we applied our experience and painted all walls Resene dark plum, matte finish. The heavy dark drapes are the exact colour as the walls (dark plum). Again, thick carpet - in charcoal colour this time. I hope this helps address your questions about your new theatre room. Best wishes!

One more thing. I just noticed there doesn't seem to be a door you can close to the theatre room. Is that correct? Also, is there also an opening in the wall between theatre room and rest of living area, or is that a large alcove? Reason I'm asking is that it may not be possible to completely darken the theatre room. In any case, I still recommend the above info.