Below is a little chart of the process on the Willie painting. When I paint realistically I don’t usually do a line sketch, I just go to town with big blobs of color. Well, in the cases of these moviestill paintings at least, since I already have the composition by looking at the framegrab, so no sketch is needed. I just sort of estimate the proportions and refine as I go along.
On the right you can see the sweet detail that the Mischief vectors bring. You don’t have to set a canvas size or resolution, you just start painting and whatever size you need it as you enter in the export dialog and it takes care of it for you. Massive headache saver.