Learning from the Natural Way to Draw

I am learning from the book, "The Natural Way To Draw" by Kimon Nicolaides in which I have the freedom to "scribble. He has quite a drawing plan for for students and I find it exhausting but well worth the effort. I am using a ball point pen and watercolor pencil to make this sketch. With pen and ink, it's like a performance, you don't know what you get and if you make a mistake you move on so there is no going back.