Pale grey with whits paint work then add an accent colour to bring it to life with pillows and a f rug using different textures.

Hi. It looks very much like their green smoke on my screen. Colours will likely appear lighter on the exterior though so you could also look at studio green which is a green black though rather than green/blue/grey

Love it just the way it is. The green banisters are so cute. However, if you want to give it more impact then I think the suggestion of adding coral is a great idea. I have sage green walls and a red Persian carpet and it just ”goes”. If you did nothing, it would still look good.

I like your grey walls. Soft and cosy. It’s a lovely room and I think it just needs more accessories. Soft pink accessories would look lovely with the grey as Sarah suggests. If pink’s not for you, soft blue or grey-green would look lovely. I would add a nice big rug (see photos below for ideas), more cushions and art. The room at the moment has all the furniture stuck to the walls with a big empty space in the middle. Bring the furniture in a bit, front legs on a rug, then add a coffee table or footstool. Much cosier!