Adolph von Menzel, Head of a Bearded Man, 1884, Graphite, The Metropolitan Museum of Art, New York. https://dartabase.art/cite/met/334928

Adolph von Menzel, Doctor and Patient, 1899, Graphite, The Metropolitan Museum of Art, New York. https://dartabase.art/cite/met/334927

Omar Rayo, Free-Fall, 1966, Charcoal and ink on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37080

Adolph von Menzel, Woman with a Crushed Velvet Hat, 1894, Graphite, The Metropolitan Museum of Art, New York. https://dartabase.art/cite/met/334929

Fernando Botero, Woman in a Bathtub, 1974, Pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34215

Fernando Botero, Painter of Still Lifes, 1975, Pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37120