Second color study: Greens.
First page is about exploring greens mixing them the 'normal' way, blue/green with yellow.
Watch how the green mixes becomes less vibrant towards mixing with FU (French Ultramarine). This is because this color holds the most red, it's complement which also can produce gray, and it sits across the line in the color wheel.
Next two pages are about exploring more green possibilities, adding reds, which produces more warm and lively greens. It is all about the ratio of warm and cool colors in your mixes, that is of the essence.
Listening to: KidCudi.