This morning I pulled out my inks to do a study of @viciousviscosity 's avatar. This one was challenging because:
a) I don't draw a whole lot of people.
b) The variety of colorblindness that I have makes pink a difficult color for me to work with.
c) I started with white paper, and had no idea how to arrive at the correct skin color using only transparent / semi-transparent ink washes.