Here's a quick sketch I did of Jeanette at a Japanese restaurant yesterday. (Link to YouTube) The donkey is Jeanette's good friend Jezzy.
I'm using a super-limited palette of gouache, just raw sienna, brilliant purple and titanium white (with just a touch of watercolor red for the ears) in a 5 x 8 inch watercolor sketchbook. For most of it I'm using a synthetic #6 filbert, which is ideal for stating the big planes and shapes, without worrying about the details of the features.
Previously: Ten tips for drawing glasses.