One way to start off a mixed media painting (or any painting, if you want) is to create an interesting underpainting. In this case, I used four successive layers of the same color. Each layer deepens the color and obscures the white of the canvas more. You can try layering over different colors, too, including layering over a solid color underpainting on the surface.
Depending on the effect you want under your painting, you can stop at any point. Any of these surfaces would have worked as a good underpainting — it's all a matter of your individual choice.
One of the many wonderful features of acrylics is their quick drying time, which allows for layering like this, both to create an interesting underpainting and to create an interesting surface of the developing and finished paintings.
Karen Lynn Ingalls
I am a working artist in Napa and Sonoma Counties, in northern California. I paint colorist landscapes of rural California, teach art classes, workshops, and private lessons, live in Calistoga, and have my art studio in Santa Rosa, California.