According to Marie Severin (1995), “[Harvey] Kurtzman colored his own art, especially on covers....”
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References:
Cassell, Dewey, with Aaron Sultan. 2012. “The Artists of EC Comics” (reprinting Severin 1995). In Marie Severin: The Mirthful Mistress of Comics. 46–47. Raleigh: TwoMorrows Publishing.
Severin, Marie (John Province, transcriber [uncredited]). 1995. “Mostly About Color.” In CFA-APA 36, January.
Cover story.