Another character by the aforementioned artist, Samantha, drawn to the same tune-

http://www.youtube.com/watch?v=vmd5Gwjy1Vg

That's yellow ink on her eyes, but it turns out that when laid over enough black ink it looks exactly like the color brown- This could also work with orange pens and is important to remember if you can't find brown inked ballpoints in your area but you want to create such an effect. Also, this is one of two works drawn entirely with both hands.