Last weekend was the second run of my new workshop "Mindful Mixing," at Oregon Art Supply here in Eugene. It's a still life based class, focusing on color and - you guessed it - mixing! I'm a huge fan of the palette knife, and spend a lot of time premixing paint colors before any of it goes on the canvas.
Below are two more exercises. On the top left is a still life of all-white objects painted using black and white. Bottom left is the same still life painted using purple and yellow only - no white. On the right, you see my purple/yellow demo converted to black and white with a photo filter to check the values.