Under Painting and Brushwork

I am continuing to  learn more about how to create and keep a beautiful under painting with Susan Sarback at the School of Light and Color. This requires a light but masterful stroke with the paintbrush. So both of them go hand in hand with this method.
These studies are unfinished and are as far as I will paint them.  When they start to look overworked, I want to move on and create another one.   They are canvas sheets taped to a board where I can put them in a binder for reference.  I learn a lot with these pieces with Susan's instruction. To remember what she told me, I put notes on the back with a sharpie.