I've just been looking at your colours, I think the Dulux Dieskau would work the best with the other colours you have to work with, choosing colours is such a personal thing and I know it can be really hard to choose and hope you make the correct choice. Oskuee is right, a paint job can look terrible half way through so you need to make sure you finish to get the proper look of colour. But the biggest thing to remember is it's only paint and it's the cheapest thing to change so if your not happy with the colour you choose you can always try something else. Happy redecorating :)

I don’t know whether you have done your painting or not but with your dark furniture and existing windows I would paint walls light warm grey and 150% strength same grey colour on the architrave .something different and grey , yellow and brown look good together.

Hi, we had the charcoal next gen decking installed 6 months ago for similar reasons - fully exposed deck, no time to maintain. Went with charcoal after much debate as we didn’t want it to look like fake wood but rather something different and modern. We’re happy with the outcome

The flooring is such a big component of a space you really need to consider it as part of the whole look you’re aiming for. I would say that generally for practically the carpet would be darker than the walls.