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.

A colour called paperbark. It has green undertones so works with both the roof and windows, although will look nice against the garden too. Another is bushland, both are colourbond colours, and available in paint too.

Actually....I have one more white paint question everyone if you don’t mind! We will be using terrazzo tiles in the bathroom (off white base with Carrara marble chips) and white textured subway tiles. I had planned to paint the remaining sections of wall white too but now I’m on this white paint odyssey I’m wondering if it’s going to work or if I’d be better to go with a contrasting colour instead. If I do paint with white, should I match it back with the wall tiles? The closest colour is lexicon which is obviously pretty cold/blue - the room has a large east facing skylight but I’m concerned about it feeling a bit sterile...appreciate your thoughts! Thanks again for your help.

I can't quite follow what you mean by 'we must keep the red roof' ? Are you not painting it , or repainting in the same colour , or would you consider a different shade ? Personally , with the White Duck , I'd go for a bolder red roof , with black or charoal gutterings , stay with the crisp white windows and veranda uprights , and the end detailing on the roof , but the window sills I'd do the same red shade as the roof , and the deck a mid grey . Oh , and also , although its cliche'd , I'd do a 1 metre tall white picket fence and double gates in the crisp white , get rid of the wire mesh haha , so everything about the house and fence looks crisp and themed , but also 'period' .