Here's a quick video showing you a casein painting of a couple of old willows in a park. (Direct link to video)
I also used a few touches of water-soluble colored pencils over the dry paint, with notes drawn in a fountain pen. I like this combination of painting and drawing materials because it's fast and you can get textures and effects that you can't get with drawing or painting media alone.
Sign up for my pay-what-you-want live stream this Saturday in New York City at Concert Window Open.
Here's the tech:
I was using Richeson / Shiva casein
1/4 inch flat brush
Moleskine watercolor notebook
Caran D'Ache watercolor pencils
Waterman Phileas red fountain pen
Camera: GoPro HD Hero rotating on a kitchen timer at 2 second intervals
Lots of info on casein at Richeson's FAQ about casein