Life Drawing, more than any other medium, is like an improvised performance. For three hours the model strikes poses and the artist must recreate them, call and response. It all happens in the moment. There is no plan. If a drawing doesn’t come together in the time the model can hold the pose, the page is turned and the next pose commands our attention. There is little time to admire achievement, or register disappointment. Michelangelo famously, toward the end of his life, burned most of his drawings. He didn’t want anyone to see the struggle, he explained. We are all…