The character is named “Davis” and I think Jack Davis drew himself in the part. From here Davis went on to other freelance jobs, including Mad and later comic book jobs, humor magazines like Humbug, Cracked, Sick, and then back to Mad. EC Comics, its horror comics and Mad led Davis to a high profile career doing album jackets, movie posters, book and magazine covers. No one needs to look at “Kaleidoscope” and feel sorry for Jack Davis. The end of EC Comics was a new beginning for him. The cartoonist from Georgia did mighty fine for himself. Mighty fine.
A day after posting “Kaleidoscope” I found a used paperback of scripter Jack Oleck’s 1959 novel, Messalina. Half-a-million copies in print. Not bad.
This is a 1963 printing, with a James Bama cover. After this Oleck did not publish another novel until the early '70s. Jack Oleck bio and bibliography.