I did this painting in a little over an hour. Mostly a lot a scrubbing with the brush on the sky and landscape. Put base color of tree on with a 1 inch brush then used a waded paper towel to remove some of the dark paint to lighten areas for some texture.
I do have to give credit to Stuart Davies. I was watching one of his videos as he was demonstrating a near identical (at least very similar) scene. His sky is a bit different than mine, as well as the foreground landscape. The tree itself is very close to what he did, but better. I think Davies only used two colors, Paynes Gray and some white, very little white (monotone). I chose Paynes Gray, white and Ultramarine Blue.
I love using his technique!