This is one of 2 paintings i did as part of my study exploring palette options.
This is using a simple palette called a vivid primary palette, 3 colours + white.
Really you don't need anything more & the colour options are infinite. The only
problem that arises in these quick studies is it's harder to get good clarity of colour
rather than a pre-mix method which i find gives you cleaner hues. Which is due to having a dirty brush & you also find you are always mixing out of mud increasing & decreasing saturation.