His colleague, the art teacher, stopped by and remarked on the arms and hands, which I just drew once and cut out. I know myself - on something tough like hands, I am always better off doing it quickly and only once. The teacher brought up these wonderful videos of Picasso painting on glass, which were taken in the 1950s. On some images, he works quickly and without editing; on others, he reworks whole sections over hours of time. Sometimes, reworking is just part of the process!