Skull

Skull, Andy Warhol, n.d.
Skull, Andy Warhol, 1974 (synthetic polymer and silkscreen inks on canvas, 38.1 x 48.3 cm)
Skull, Andy Warhol, 1976 (acrylic and silkscreen ink on canvas, 38 x 48 cm)

Self Portrait (Eyes Closed)

Self Portrait (Eyes Closed), Andy Warhol, 1979

Electric Chairs

From the top:
Electric Chair 1967 (Collection of the National Gallery of Australia)
Electric Chair 1964 (Tate Collection)
[no title] 1964 (Tate Collection)
from the Death and Disaster Series
(here and here)

Little Electric Chair Paintings

(here)