If you know anything about the brain you will know that it consists of 2 hemispheres, the right and the left hand sides of the brain. The left side is the ‘logical’ side and the right side is the 'artistic' side. Many of us work using the ‘logical side’. Now I am not going to rewrite the book, just point out a few of the techniques that the book describes.
Technique number 1: Vases and Faces
Whenever I sit down to draw I do this exercise. It makes me physically feel and experience the switch from the left to the right side of the brain. First draw a profile of a face, as simple as possible. Now lift your pencil and create a mirror copy of the profile. This time you should experience the switch to the right side of the brain. You will find yourself drawing lines and angles that hopefully match the original profile. and you will not be drawing eyes and a nose and a mouth. Did you experience the shift?
Now try again this time drawing a really grotesque witch like profile. Same again copy the profile.
And this is how mine turned out!!! OK he is a bit BIGGER in my drawing but there is no disputing the likeness.