Girl Before a Mirror shows Picasso's young mistress Marie-Thérèse Walter, one of his favorite subjects in the early 1930s. It is also a complex variant on the traditional Vanity—the image of a woman confronting her mortality in a mirror, which reflects her as a death's head. On the right, the mirror reflection suggests a supernatural x-ray of the girl's soul, her future, her fate. Her face is darkened, her eyes are round and hollow, and her intensely feminine body is twisted and contorted. She seems older and more anxious. The girl reaches out to the reflection, as if trying to unite her different "selves." The diamond-patterned wallpaper recalls the costume of the Harlequin, the comic character from the commedia dell'arte with whom Picasso often identified himself—here a silent witness to the girl's psychic and physical transformations.