I wanted to explore using a particular colour as a shadow colour. I decided to paint a simple tree and use a blue / grey mixture for the shadow. So I mixed up some green, some grey/ blue and some of the same grey / blue with a little green in. The green mixture I varied as I painted adding yellow for highlights and then blue to darken it down.
I began by painting the main body of the tree with a basic green and then adding a lighter yellow/green to the left side and a blue green to the right:
Then I just built it up. One of the hardest things was knowing when to stop. The most fun part of the painting though was the trunk and branches. I especially enjoyed putting in the shadows for this (although my control still wasn’t what I hoped and I had to do some bits several times).
Here’s the finished study.