To wrap up this productive Saturday, I have tried out some "Sgraffito", a technique I came across in the past, but that has surprised me again today. Time to pay a second visit!
It's actually very simple: you create 2 layers, the first one with oil pastels, the second one is a layer of acrylic paint. When it's dry you can start scratching the acrylic layer away. Of course there are much more possibilities with Sgraffito.
Here is a first trial, more soon!