I took a class from Mary several years ago and heartily recommend her as a teacher.
Here is a quote from the introduction to the book which I especially liked: "I believe that artists are the visionaries of this world. They help us see and interpret this amazing experience of life. We spend our lifetimes struggling to do that special masterpiece and don't realize that WE are the masterpiece. Your paintings are your shadow. I value you, my dear fellow artists. I know you bring us a better vision of this world."
Mary shares her knowledge fully and there are several step by step techniques with photographs to help explain her process.
I especially liked her examples of paintings from other artists who used her techniques.
Both books are useful whether for a beginning or more experienced painter. Lots of good ideas and techniques to try out.
I give it five stars!