@amanda thank you. We actually had a similar blue (Rainstorm) in our old bedroom as an accent wall and we liked it. I really like Meditative too, calming color. I will keep this in mind!

I would recommend to use wallpaper behind the bed and tv area

I would also use the same color for the curtains and hang 3 -4 panels (1 on ach side and 1-2 in the middle) like here http://sainteriordesignstoronto.com/arcadia-house.html

This will create an illusion of bigger window

What a nice big room, lots of possibilities! Me, I hate accent walls. I feel (as a non professional decorator ) that you really should love the area you want to accent. Otherwise it stands out as just "oh, that's a different color." This is probably my personal bias. But we bought our home from someone who had used a decorator. She had Several accent walls and they just didn't make sense. Perhaps she was just a lousy decorator, lol, but it looked choppy. In my opinion, your wall would look chopped up with the bathroom (I think) next to alcove.

Your ceilings are not too high, the room looks cozy and peaceful. So I vote for one coolish color. I think grey is getting overused even though I still like it. But maybe something with blue/grey overtones?

I would consider a muted green something like the below which is Guilford Green:

https://www.houzz.com/photos/sea-girt-shore-portfolio-tropical-bedroom-boston-phvw-vp~328159