Light fascia, a not quite white, but very light colour that matches the yellow house - maybe the colour on the knobs on the platform. Same light colour for the posts & rails of the deck for all except the very top hand rail leave that grey. Like the first picture in the comments. Paint the end board on the bottom stair platform the same colour as the house. Grey stairs perhaps. Leave knobs light.

In my last house, after adding a living room (the area you see this side of the arch) and also updating bathroom etc I couldn't afford to reline the ancient walls in my little lounge (when I removed the purple wallpaper I found a mixmax of boards, gib, pinex, plywood and holes!) so I plastered walls all over with layers and layers of newspaper and wallpaper paste (papier mache), then after applying primer/undercoat I painted with 2 similar colours (rich reds in this case), and stippled the surface with a plastic bag. This made it look just very slightly textured like leather and successfully disguised the uneven surfaces. Gallons of gap filler filled the gaps between the old T&G ceiling boards and evened out the mismatched skirting and scotia. Again white paint on all the trims. Amazing what can be done when you have to make do! This was a great cosy little room! (Before photo is the 3rd one)

Hi. I agree painting the posts & blocks (if you need to keep them for structural support) white. Another idea if you are handy is to build a timber rail and balustrade (painted white?) in place of the lattice. The lattice does provide some shade lower down, but maybe you want a different look. Your bricks are a good colour, and I like your Acapulco chairs and the macrame pot hanger. I think you could run with those colours (along with the white paint idea) and pull off a Mexican theme in this space.

I'd start with the basics . The fences , which seem to enclose 3 sides , let the place down . I'd go with 4 or 5 10 litre pails of fence stain , in charcoal/black -- I dislike Brown ( too 70's ) but I don't think it would suit anyway . Then some colour , and 1 focal piece . I'm in NZ , so not sure plants to recommend , but maybe a palm ( or two or three of differing heights ) as your focal point , and some colourful semi-tropical plants . The existing garden along the fence probably stain the low wall in the same charcoal black , to tie in with the fence , but add a lot of light / white pebbles , shells and similar -- any coloured plants or flowers will be highlighted . Then , depending on budget , build in a barbeque , with paving . off the covered area , and add a sail shade -- set up so it isn't over the barbeque area , and use a brighter colour canvas -- that yellow 'box' that is in the 3rd picture of yours stands out -- a sail in that colour , or mid orange or red , a reasonably vibrant green or blue , or even a neutral grey , will add colour but also distract the eye from the rectangular shape of your house . From there -- do what you like / can afford . The sky is the limit -- playground , pool , spa , water feature , sculpture -- wherever your taste takes you .