.

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A pin-up portrait in the exact flavor I had in mind when starting this topic, from FANTASTIC FOUR 250.
https://viewcomiconline.com/fantastic-four-1961-issue-250/



And just a year or so later...

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...this similar pin-up page, made from a Byrne cover for COMICS FEATURE 27,(Feb 1984), introducing new FF costumes, in this version made into a convention pin-up page.