peeled paint technique

The background of this painting is called 'peeled paint'.

On the first layer with acrylic paint you put on some spots a little bit vaseline.

Then you paint the next layer with a different color. On the spots with vaseline you remove the paint of the second layer and the color of your first layer comes through.

So you can adjust more layers and see the former colors.

I painted the imperfect girl with acrylic paint.
You can find films of this technique on Youtube.