“These are the steps I took while painting my recent caricature, ‘Aretha Franklin’. The sketch was drawn in Photoshop, using a small round brush. For the painting I used Photoshop CS and a Wacom Cintiq; the size of the final painting is 13 inches wide by 14.5 inches high, at 300 dpi resolution.”
http://www.3dtotal.com/team/Tutorials_3/makingof_aretha_franklin/aretha_franklin_01.php