If we did not remember we were jokingly "boo'd" at. I don't think any of us passed Bob's Law test. His famous law states..........."You never make a mark unless that mark is related to something that already exists!"
Although I do not plan on painting portraits I found this class to be invaluable for learning techniques to compare distances, angles, positive and negative space, proportions of the face along with blending skin tones. Now if only I could find the time to practice.