Choosing the external paint colours is one of those things that you should take some time over.
It is an expensive exercise and if you don't like the end result you will have to live with it for a long time.
There are many houses I have admired over the years in our suburb - I have photographed a few below but on a cloudy day so none of them look as lovely as they do in real life:
Some of the features that they all have are neutral colours and symmetry. I wanted to retain the symmetry in our house by maintaining the verandah on three sides. I also predictably wanted to keep the house white, but when it was painted as part of the "first" renovation the trimmings (gutters and verandah balustrades) were a dark heritage green. I wanted to update this colour scheme a little by having grey tones.
Again I had good intentions but quickly became overwhelmed by the enormity of choice available. In the end I selected four colours, painted them on a large piece of timber and decided that they looked fine. The exterior painting is still a work in progress but it's almost finished.
We ended up choosing Lexicon Quarter for the windows and verandah railings, Lexicon for the exterior walls, Simone Weil for some of the battens, and Leadman for the gutters and balustrades. All are Dulux colours.
windows and French doors downstairs still to be painted