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Thank you Jim, f, and Lisa. Minor White once wrote that a photographer should always strive to make good pictures even if their purpose was so simple as testing a new lens. In other words, the photographer should never relax into mediocrity merely because the picture is "unimportant." So here, though the purpose was merely to demonstrate a simple lighting technique, I took pains to make sure the pose was decent, the background clean, the eyes in focus and the expression good. So I agree with Minor.
The result of this carefulness was that Tom, my subject and student, fully understood the point of the lighting technique. The set up was not about mere technique.