José de Ribera, Magdalena Ventura con su marido, 1631. Courtesy of Museo del Prado. 

Andy Warhol, Self Portrait, 1966. Acrylic, silkscreen ink, pencil, and ballpoint pen on linen, 22 5/8 x 22 5/8 in. © The Andy Warhol Foundation for the Visual Arts/Artists Rights Society (ARS), New York.

"Through the Collector's Eye: Postcards from the Henry Baker Collection." Courtesy of  The Lesbian, Gay, Bisexual & Transgender Community Center National History Archive. 

Simeon Solomon, Sappho and Erinna in a Garden at Mytilene, 1864. Courtesy of Tate Britain.