You can't go wrong with Dulux Natural White, it's the perfect neutral white, (like a milk white?) not warm, not cool, and no dated creamy undertones, looks perfect everytime I've seen it. I like Antique White USA for older homes (it looked great in our old Victorian home), but I sometimes find it too creamy. But consider your flooring too. If you have warm coloured timber floorboards for example a Natural White or warmer would work and would make Lexicon for example look too crisp.

We have used Ecolour interior and exterior paints on our renovation and are very happy with this paint. It is low VOC and made in Australia. There is a store in Byron Bay, if that's not too far from you, or it can be ordered online and delivered to your home. You could speak with them regarding the suitability of their products for external sun in Queensland. They are made for Australian conditions, are advertised as environmentally friendly. They can colour match with Australian paint companies. Though for exact colours the paint companies always recommend using their own brand. You could also go to Dulux Australia's website and chat to a colour consultant online, re suggested choices for a white for external walls in Queensland sun, with terracotta roof to go with the colours you've mentioned. They are very helpful I've found. We have Snowy Mountains half trims and doors externally, which we chose as it wasn't too bright in the northern sun. You can also buy A4 sized colour swatches from Dulux to put up against your wall outside and see how the light reflects and what tones are coming off it. Place your other swatches of colours against it to see how they suit. Do you see any other houses in the neighbourhood that are similar colours to what you are hoping for? Do you have any Snowy Mountains Quarter left that you could paint on a board to see what it looks like outside with the other colours that you like?

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!

Just be aware that the purer the white the more colour will be reflected off the floor. Your timber floor has some strong reddish tones, so any pure white walls will pick up a slight pink tinge as the red colour will be reflected off the floor, especially with any direct sunlight bouncing off the floor. Sample pots are the way to go, or steer away from the purer whites and go to warmer off-whites and beiges where the pink tinge will be less noticeable (but still there), Best of luck, Dr Retro of Dr Retro House Calls and Dr Retro Virtual Visits.