Actually finishing earlier this week, here are two pieces completed for the Summer of Colour challenge using two purples and a yellow. The first one I use the purples with just a touch of yellow and the second one uses a wash of yellow over the entire painting, apart from the reserved shapes, with more layers of yellow in some selected areas.
I couldn't choose a favourite, so I am including both!
Here are the mixes I used: The darker purple is ultramarine and magenta, the lighter purple is cerulean, magenta and white and the yellow is cad yellow medium with a little white.