I did this “selfie” using only my palette knife and my fingers. It’s an exercise that helps you paint more expressively and create unexpected textures. It also doesn’t allow you to blend very well, which results in color richness. I’ve found that by using palette knives it’s much easier to avoid the effect of chalkiness and muddiness in your painting. Watch the video:
This demo shows how you can paint effectively without worrying that you might lose your progress or ruin your painting. I thought I’d discovered this method a few years ago, but recently found out that the artist Abbott Handerson Thayer(1849-1921) did almost the same a century ago.