Gerry Garcia by Whit Clifton
This was done on a black "wax board".
The image was "carved" from the wax to expose the white background below.

The Doors by Whit Clifton
Hand drawn with pen and ink... believe it or not!

The Doors poster.
Artwork by Whit Clifton and Randy Tuten of Great Impressions in San Francisco.
(Note the background pattern is a grid of the band's name!)