I was working with a high school student on a self-portrait project and did this little drawing of her in her sketchbook, demonstrating certain landmarks of human physiology and how they can sit in perspective. It almost looked like her, which was a plus. I don't usually do demos that require this kind of accuracy, as failing miserably at them can really muddy whatever point was to be made.
I made a photocopy of it and brought it home where I produced the following small oil painting from it.
It still almost looks like her.