1. Look at the following blog post on Francoise Gilot and the variable thickness in the expressive contour lines.
2. Look at Google images for Francoise Gilot portrait drawings: http://www.google.com/search?q=gilot+portraits&client=safari&rls=en&source=lnms&tbm=isch&sa=X&ei=FWpKUtjWCvGFyQH6m4HIDA&ved=0CAkQ_AUoAQ&biw=1440&bih=679&dpr=1
Look especially at the contour line drawings by Gilot, portraits of Jaqueline by Picasso, and the color and shapes used by Warhol.
3. In the videos below, look at the speed drawing and the portraits by Warhol. When the drawing starts to talk, you can just listen to the interview if it is too wierd for you. Also enjoy the David Byrne music accompanying the Warhol imagery in the second selection.
4. Post your favorite portrait drawing from any of these sources and any other artists (black and white or color, linear or painterly.) Explain what makes the drawing expressive and how you might incorporate some of the techniques into your portrait “derivatives.”