Great room. Can we see more photos showing more of it? This would also help to help you.

Love arc3d’s picture! I can also see a New England look - traditional furniture in pale blues, creams and natural fibres. Something like this

Yep - it’s just a very good all round paint. It’s in our bedroom and en-suite too. I like it because it is a very flat matt. (We have Little Greene Intelligent Matt in our main bathroom, but only because i likes a particular colour). Mylands is expensive - slightly more than Farrow and Ball, however I always buy from Paint Depot online who are a tad cheaper and usually have an extra 10% offer too. (I get testers from my local Brewers though because I like to look at them!)

with the colours you are picking, I'd go for an oatmeal or sandy tone, of white with a hint of grey-blue. Stark greys will be too bland - you need something with sufficient warmth to accentuate both floor and give contract to the "cooler" blue unit.