Amy Bruni - Sketch/Study for commission portrait

When doing a commission piece, I like to do a loose sketch/study of my subjects before anything else - before thinking about lighting, composition, size, etc. I need it to be fresh, easy and almost caricature like. It helps me to get familiar with the subject's facial structure, specially when I'm working with a limited number of reference pictures.

This is the Study/Sketch for Amy Bruni's portrait that I'll be doing soon.