I would paint the roof charcoal grey, the exterior walls a lighter grey. Trimmings in black, same with the slats beneath the verandah. It would blend into the environment and bring attention to the view of the mountains in the background. To add a pop of colour and bring focus to the front door in an inviting way, I would paint it red.

grey and white always look good but Google "choosing colour schemes" for all the different paint companies services for matching colour schemes

Sydney is out of my comfort zone for plant naming. I would still use the line of trees on RHS of driveway. I would clear the area on the left also. Consider tall trees towards the front of your property with open crowns. Double storied homes need tree height to provide balance. Closer to home maybe one or 2 smaller deciduous trees to give shade in summer. Retain the LHS of driveway with large embedded rocks. Maybe only native Lomandra with only 1 variety in pockets in the rocks. Very simple concept, but I believe will add real value to a good home. Please bear in mind that this advice is from a photo only.

I like the darker charcoal and white , if repainting make sure it is a nice deep charcoal , NOT a dark grey -- as gwyn says , why be ordinary ? I'll offer 2 thoughts though -- the first would be a bit more white , such as the terrace railtop , and maybe a small 'sculpture panel' on the main wall ( it looks like there is one on the end wall ? ) . Easy to do . Option 2 and 2a is not quite so easy , and may not suit the neighbourhood , but 2 more authentic colour options -- Scandinavian Red is what I would call Barn Red -- with the white highlights that looks the part ! The other option on that thought track is Swedish Blue -- authentic , but not a favourite of mine , and again it may look out of place amongst the neighbours , and its too close to grey for my liking , but with crisp white highlights it can look okay . So I suppose 3 options from me haha -- slightly darker charcoal , with white highlights ; Scandinavian red with white highlights ; Swedish Blue with white highlights .