.


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And by John Byrne. This page is from FF 258. It took some probing of the long-term memory to recall precisely where I'd seen it.
https://onemillioncomics.com/fantastic-four-1961-issue-258/

Byrne did some great Doctor Doom stories and pin-up pages, in FF 236, and 246-247, and in 258-260.




[Linked Image from ic.pics.livejournal.com]
full issue at: https://onemillioncomics.com/fantastic-four-1961-issue-236/



[Linked Image from static1.cbrimages.com]
full issue at: https://onemillioncomics.com/fantastic-four-1961-issue-258/

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( also from FF 258, page 7 )



And...

[Linked Image from coverbrowser.com]
( a more playful and less serious Doctor Doom, from the cover of FF 238 )
full issue at: https://onemillioncomics.com/fantastic-four-1961-issue-238/

It took Byrne a few issues to build up to it. But he certainly got around to including a more menacing Doom in future FF issues.
And then some.

https://readcomiconline.li/Comic/Fantastic-Four-1961/Issue-236?id=26934

https://readcomiconline.li/Comic/Fantastic-Four-1961/Issue-246?id=26945
https://readcomiconline.li/Comic/Fantastic-Four-1961/Issue-247?id=26946

https://readcomiconline.li/Comic/Fantastic-Four-1961/Issue-258?id=26958
https://readcomiconline.li/Comic/Fantastic-Four-1961/Issue-259?id=26959
https://readcomiconline.li/Comic/Fantastic-Four-1961/Issue-260?id=26961