"I hate to paint portraits I hope never to paint another portrait in my life. Portraiture may be all right for a man in his youth, but after forty I believe that manual dexterity deserts one, and, besides, the color-sense is less acute. Youth can better stand the exactions of a personal kind that are inseparable from portraiture. I have had enough of it."
January 1, 1970
https://en.wikiquote.org/wiki/Dexterity