Here is another sequence of the development of a painting. The first image is the finished painting. Next to that is my reference photo of the house. I did a quick study sketch while I was there, but I like to take a photo for later use. Frequently I only have time to do the sketch, and I paint it later in the studio.
Notice how the small sketch is a simplified roadmap of the basic shapes and values of the final painting. I refer to the sketch during the painting process to keep me on track. I am always free to deviate from the plan, but I want to do it by intention, not by default.