I created this brush set as I was looking for brushes that could create the 3D effect of an impasto brush stroke. I tried to create 4 unique looking brushes that looked like actual thick paint on canvas. I hope it helps you create amazing artworks. Good luck!
IMPORTANT:
To be able to utilize the Impasto effect, you must select an appropriate secondary color. Think of it as the shadow's hue, whatever fills the holes between paint pigments and the canvas. In the image I am sharing I selected a blue primary color and an (almost complete) black as my secondary color with "Tbrush4".

Hope it helps you create the Impasto thickpaint effect. Have fun!
Typhoon Impasto Brushes