Cf. D. L. Thompson, Mummy Portraits in the J. Paul Getty Museum, Malibu, 1976, p. 7, fig. 8 for a similar portrait without the side-lock; and S. Walker et al, Ancient Faces: Mummy Portraits from Roman Egypt, The British Museum, London, 1997, pp. 101-102, no. 94 "The locks of hair represent the Horus lock worn by children of both sexes and cut at puberty in a ceremony called the mallocouria."