The faces I chose to represent Demetrius, Holconia, and Iris in A.D. 62: Pompeii are examples of the Fayum portraits; these were lifelike paintings on the mummy wrappings of people buried in Roman Egypt in the first and second centuries A. D.
The Metropolitan Museum in New York City has some fine examples of Fayum portraits.
For more information about the Fayum portraits, see either of the following sources:
Doxiadis, E. (1995). The mysterious Fayum portraits: Faces from ancient Egypt. Harry N. Abrams, Publisher.
Walker, S. (Ed.) (1997). Ancient faces: Mummy portraits from Roman Egypt. Metropolitan Museum of New York.