A related book, and the basis for much of whats in Drawing on the Right Side of the Brain is The Natural Way to Draw, by Kimon Nicolaïdes. It is a text book

A related book, and the basis for much of whats in Drawing on the Right Side of the Brain is The Natural Way to Draw, by Kimon Nicolaïdes. It is a text book and has structured lessons in it, so if you need formal structure its helpful. Following the lessons is not required to gain a lot from this book.