Every time I paint a portrait I lose a friend.
You can't do sketches enough. Sketch everything and keep your curiosity fresh.
Cultivate an ever-continuous power of observation. Wherever you are, be always ready to make slight notes of postures, groups and incidents.
A portrait is a painting with something wrong with the mouth.
A portrait is a picture in which there is just a tiny little something not quite right about the mouth.
I don't dig beneath the surface for things that don't appear before my own eyes.