If you have had a chance to watch any of these early Superman cartoons, the images along the bottom page are wonderful examples on Superman's "almost smile" that shows up in all the films.
Superman Model Sheet OK's by Dave Fleischer
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From Fleischer/Famous Studios “Superman” (1941). A Fleischer Studios Superman stat model sheet showing the head sizes for Superman signed by Dave Fleischer. "Aug. 1941" "OK Dave Fleischer" [Item: 12"W X 11.25"H] SeqID-0527