After doing several of the others, I thought I'd come back and try putting shadows and highlights on Sarah's portrait. I also decided to color her hair more naturally.
"Dr. Sarah Allison is one of the foremost authorities on moon morphology and geophysics. She has clocked over 100 hours exploring the moon's surface. She holds the George P. Kokh Chair in lunar planetology at New Mexico State University. Currently she is to be found at the European University Collectives Marius Hills Lava tube expedition in the Ocean of Storms on the Lunar surface."
Drawing by Daniel Fu. Digital ink and paint by Terry Hancock.