I sketched him in an evening amidst the clutter of my painting studio. I appreciate that kind of unstudied natural situation, where someone is just doing what they love to do, no questions consciously. My main concern was how to simplify the scene that I had only two principalities tone. Using 2B and 4B graphite pencils, I returned his accordion and his hair dark shapes as fairly uninterrupted, which helped to highlight the mild form of his left arm.
Dan Gurney, link.