This is underpainting. I have never tried this and I really don't know why. The idea is to block everything in, especially the lights and darks, let it dry and then start painting in color. I learned about this in college and some painters show this stage of their painting on Instagram. Why I have never tried it, I don't know. But the other day I said "what the hell" give it a try. And I am painting on
18"x 24" canvas. Wowie! the biggest thing in recent years.