Andy Warhol, “Dolly Parton,” 1985, synthetic polymer and screen print on canvas. Impossibly perfect, “it’s as though the canvas itself had a session with a skilled makeup artist.” Credit...The Andy Warhol Foundation for the Visual Arts, Inc./Licensed by Artists Rights Society (ARS), New York; via Crystal Bridges Museum of American Art, Bentonville, Arkansas; Photo by Edward C. Robison III