Israeli artist, Einat Aloni, in a post about her teacher, Sasha Galitsky (beautiful art journal in that link, don't miss it!), explains how she convinced him to be her teacher, and describes a lesson:
"Sasha gets angry when I outline my images in black ink. He can't stand the thought that I approach my drawings with a finished idea in my mind, he splashes some paint, adds a cockscomb, sticks a tail, turns the hands into legs and the ground into clouds".
Drawing by Einat Aloni and Sasha Galitsky
Don't you just love it? :-)