Butte States - stage 4

Today I painted the first colour pass on the sky. In the old days as an illustrator if there was a blue sky I just airbrushed a gradation of something like layers of acrylic Phthalocyanine Blue from dark at the top to light at the bottom. Now I work in oils I like to have more variety of colour in the sky so there are greens and purples there too, all modified by dashes of Permanent Orange to take the saturation down a bit as well as to have some of the land colour in the sky for harmony of colour across the painting. "As above so below" being the motto for this way of using colour.
The paint mixes are made up of Zinc White, Manganese Blue, Phthalocyanine Blue, Kings Blue Light, Emerald Green, Manganese Violet, Permanent Orange and Lemon Yellow - mostly Michael Harding paints with a couple by Winsor and Newton.