I would go for a green or a blue, or a mix of the two!

Your couch has an amzing color! It's in the set of "cold" colors. For this reason I suggest a face powder color, sorry for my english, I'm italian. With lime the warmth of the material would go perfectly well and create a warm feeling. Carolina

Such a lovely freplace! I think dark blue walls would look stunning and tie in well with the sofas and tan armchairs, then add a faded blue Persian style rug. Good paint colours are F&B Hague Blue or Stiffkey Blue. A more navy/green tone is Inchyra Blue. Little Greene do a lovely navy called Woad, and their Juniper Ash is a paler version. Here’s some ideas: LITTLE GREEN WOAD F&B INCHYRA BLUE

Green is not a colour I'd usually go to, but green grey could be ok. I'll have a look into that one too. It's quite a dark room because the long living-dining room leads into a conservatory, so the dining rooms windows are all now internal.