Don Davis is a space artist and animator. He is a member and Fellow of the International Association of Astronomical Artists. Visit his website to see his paintings and his writing on the colors of Mars.
In 1971 I was being trained to work with the airbrush by the map artists at the U.S. Geological Survey's Branch of Astrogeologic Studies in Flagstaff. However, the project I ended up spending about a quarter of a man-year on was a hand-painted map globe of Mars.