Taking an image from my sketchbook, I picked a drawing of a couple of trees as my subject. I applied a layer of gesso on cold-pressed illustration board with a broad brush and then drew the image on top of it after it dried. I then laid down a warm wash of color (gouache) for the bark of the trees. The second layer was the green mixed with black for the outline and leaves. The third was the mask for the inset image. And the last layer included a cool blue wash (acrylic) over the rest of the painting. I lifted the mask and exposed the warm inset image. The last step was to touch up the darks and lift the paint with a wet brush & cloth for the highlights on the bark. Looking back, this technique could be translated into Photoshop and Painter which I'm exploring now!
