Diego Rivera’s Mandragora, 1939 seen at the San Diego Museum of Art.

From the museum’s wall description-

Diego Rivera created many portraits during his long career. Some portrayed unnamed individuals who agreed to pose for the artist, while others depicted close friends and well-known figures in the arts. The sitter of this work has been identified as Maya Guarina. The delicate lace headpiece and dress worn by Guarina contrast with the skull she she holds in her hands and the spiderweb in the upper left-hand corner. In the upper right-hand corner emerges a small mandrake, a plant identified as a hallucinogen and associated with magic. While these objects might reveal something about Guarina, they also contribute to an enigmatic portrait with Surrealist qualities,