It is known that Frida painted many portraits for her friends and acquaintances while she was in San Francisco from November 1930 to June 1931 and this tincture, portrait of Eva Frederick, is one of them. Although some people insist that the plot of this painting is only an acquaintance and no one knows more about it. Others said her name was Eva Frederick and a black work model. They also said that he posed for Rivera and other artists in Mexico. The reference at the top of the oil says: “Image of Eva Frederick, emerged in New York, painted by Frida Kahlo”. In the middle of that year, Frida also drew a nude pencil sketch of Eva Frederick.