I thought rather than posting in the finished result, I would show the different stages of this painting. The inspiration is a photo of a view of Zorten (Switzerland) nestled in a mountain valley.
I usually start with the sky, but decided to lay in the foreground first, keeping the greens on the yellowish side to make them appear closer.
Next, I painted the sky and the distant mountain range. For the mountains, I used cerulean blue mixed with raw sienna, which greys the blue rather than turning it green. After that, I filled in the forested mountain in the middle ground, using cobalt blue mixed with phthalocyanine green and raw sienna.
Finally, I added more detail to the far mountains, mixing cerulean blue with permanent alizarin crimson. This gives a nice greyish purple.
Mountain views are great to paint, as they make compositions easy, providing lots of zig zag lines.