I thought I would share some details of a work in progress. Starting out, I usually complete a detailed drawing using charcoal or a sepia pastel, then apply several coats of fixative so I can keep my "blueprint" of the image as I begin adding color.
I'm painting an image of a courtyard inside the Villa Cimbrone in Ravello, Italy and using my iPad with reference photos.
After a few coats of fixative, I'm ready to start laying in color for the underpainting. Using broad strokes, I cover the entire surface with the lightest lights, darkest darks and then the middle values.
Using turpenoid, I wash the entire painting to ensure all of the white is covered and the colors are set. This usually dries in about half an hour and it lays the foundation for local colors to be introduced.
Layers of color are then applied over the underpainting and I usually work around the entire painting at this point so as to keep colors consistent as I go.