I couldn't say who painted the 
Private
Detective Stories May 1941
cover. Three
artists at Trojan around this time that I can name are H. J. Ward,
Harry Parkhurst, and Allen Anderson.
The cover of the 1977 paperback edition of 
Charg,
Monster is, of course, by Jim
Steranko.
 
Steranko's draftsmanship really improved when he began using reference.
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