![Roz-1](https://www.antjegilland.com/wp-content/uploads/2016/02/roz-1.jpg)
From this source.
For those of you who sometimes wonder what this medium is that I mention so often, there is a fabulous video on gouache by Roz Stendahl which you might find informative. You can watch it on the Sketchbook Skool blog masterminded by Danny Gregory.