This is a painting I finished awhile ago in Painter. Painter is a high-end painting app made by Corel. I made this painting with thick impasto brushes that I made. Painter comes with probably hundreds of brushes. But I like to make my own to do exactly what I want them to do.
Painter has a very complex brush engine. This is both a plus and a minus. It has taken me a long time to understand the brush engine. But now that I have, I can make brushes that do what I want them to do.
The brushes I used for this painting are particle brushes. The particle brushes in Painter are based on physics. They can be pretty wild. But if you get control of them, then they can look very realistic and mimic real brushes.
Then you can add in the impasto effect to them and get a really interesting brush.