I've been taking a pastel course in Painter x3 and took advantage of a feature were you can double load the brush by setting the expressions feature. In this case I set it to rotation and as I turn the stylus, the paint applied varies from the one color I have picked to the second color I've chosen. In this painting it was perfect for adding a variation of colors in the clouds that would blend as I painted. I did make one mistake when I did the final highlighting on the clouds. You'll see texture in the white while the rest of the cloud is soft. I'll have to figure what I did wrong. Hope you like it.