Hi dani, your living/kitchen area is not huge, and you have three different finishes in your kitchen. I think that this is probably enough in the space, so I would definitely go with a warm, light, neutral that works with the colours in your overhead cupboards for all of the walls. You don't need a dramatic feature wall like your blue/grey wall in a smallish room. The wall colour should visually link the kitchen area to the rest of the space. Think understated and elegant...

What about painting it green to tie in with the trims?

I really like the ceiling, as others said it gives it atmosphere and frames the view. When you say pine, I'm thinking you mean the finest of all the pines - Oregon which is fine grained and a warm honey colour. I have a cathedral ceiling and I would gladly swap my bland white faux Hamptons look with you any day! I would look at a large rug for the floor - if the budget is small, find a carpet that you like and get it edged as a rug - my favourite hack. I agree to bring in some black in the curtain rods and swap out al that cream/yellow paint for a neutral white. Your kitchen reminds me of mine circa 1998. Change the splash back to something neutral. Even white painted glass or a white textured or interestingly shaped tile. Swap out your bar stools for timber and introduce some timber elements in the kitchen to match the roof. Think chopping boards,, timber bowl for fruit, utensil holders, pot plants. Paint the walls white as well. All the creams in the world won't help the ceiling look better. you need to work with it not against it. Good luck and keep us up to date!

Try something to match your benchtop maybe natural white, hard to tell on iPad. Add some warm tones with chopping boards etx, you are seeing it at its worst.