Butte States - stage 7

OK I think I've pretty much finished the sky barring a few tweaks later on. I wanted a Big Sky with clouds typical of the South Western deserts of the USA, the colour scheme of the painting based on the red orange/ green blue complementary axis.
I have also made a start on working out the lighting design of the landscape, which areas are in shadow, which ones are in the light using a transparent Violet/Burnt Sienna mix.