Here's a challenging exercise for practicing brushwork: Try to paint a scene or object within one minute, interpreting it in a notan design, using black gouache and a big brush.
A minute goes by very fast, as you can see in the video. (Link to video on Facebook)
Not only is there no undo button, but also there's no time for hesitation, and you have to use a brush fully loaded. Materials used: smooth bristol board cut into a 5-inch square, black gouache, synthetic round brush size 12.
You can watch the video looping on Instagram @jamesgurneyart