Always seek professional assistance. Be it a colour consultant, designer or a house painter. Always good to bounce your ideas around here as a lot of good advise is given, certainly if you're not sure of where to start. Have a chat to a local house painter, they're the best ones to give solid advice. Paint brands are usually pretty good, certainly the well known ones like Taubmans, Wattyl, Solver, Dulux. Trusted brands been around for decades. Colour consultants are good as they live and breath colour schemes. They can come up with colours to use that the rest of us wouldn't even think of. Terracotta roof is timeless and classic so you're certainly not limited.

Flip up and bi-fold are indeed "all or nothing" options that can be tricky to screen too. Both also rely heavily on well-engineered operating mechanisms and as such come with increased potential for problems. I once stayed in a house on North Stradbroke Island which had a large flip up gas strut supported timber framed window over the north facing kitchen sink with views to Cape Moreton. (I now wish I had a photo to share, but sadly I was too much in the moment to take any.) Standing at the sink, looking north over the Coral Sea with Humpback whales breaching in the distance was one of those forever moments. Plus, our elevated situation seemed to reduce the number of insects that came through the unscreenable window. In that case I wouldn't have compromised on spending to get that window out of the way. For just about every other context I would opt for a less complex, less costly, screenable, servery style window.

The Stratos switches are a Clipsal brand. Go to their main website or contact a local supplier.

Is the first pic you posted an older one , maybe off the for sale ad ? It looks several shades yellower , but the gardens are quite different too . So that leads me to conclude it is fading on its own account -- that makes it easier IMO , just do nothing and it'll fade more ! Buttery yellow and brown were 80's , and pretty naff now , but instead of black , I'd go a Japanese Black -- a bit more matt , even blue hues there too -- more interesting , again just my opinion . The terracota does look slightly out of proportion , but lighter walls , darker trim and the orangeness of the terracota for interest would be my go , but then I'm not a fan of too much white on walls -- I'd prefer the 'relaxed casual' of a beige , jap black and terracota to crisp whites . I also assume that timber and the area to the 'right' of the stairs is the area closest to the street ? No matter what you do ( I'd go Jap Black stain on the wood , but do what YOU want ) I'd look at a bark garden or rock garden , with probably cactus and flax and reds and yellows and greens -- the timber looks too much in proportion to the render in the picture , so i'd soften that ( basically hide part of it ) . I like the character and it can get even better -- a great base ! Well done !