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A Byrne pin-up of Sue Storm, from FANTASTIC FOUR SPECIAL EDITION 1 (and only) May 1984.
Reprinting FF ANNUAL 1 (1963), by Lee and Kirby/Ayers, with a new wraparound cover by Byrne, plus 5 new Byrne pages added to the story, and 5 full page pin-ups after by Byrne of the FF and Namor.
Story pages are numbered on 1-17. After page 17 by Kirby/Ayers, the 5 pages inserted by Byrne have no numbers, then the Kirby/Ayers art continues with pages 19 to 37.
(Only page 18 is omitted from the original Kirby Ayers version.) NOT clearly credited in the printed 1984 issue !
In the 1984 edition, 20 additional pages of Kirby/Ayers pin-ups and bonus pages are omitted.

https://readcomiconline.li/Comic/Fantastic-Four-Special-Edition/Full?id=169370 (1984 version, with all the Byrne pages and pin-ups)

https://readallcomics.com/fantastic-four-v1-annual-001/ (the original 1963 version, for comparison)
( the main story in FF ANNUAL 1, and the 15 villain pin-ups are all reprinted in FF ANNUAL 8, Dec 1970. https://readallcomics.com/fantastic-four-v1-annual-008/ )
( the one omitted story, "The FF Meet Spider-Man", a 6-page story from FF ANNUAL 1, was reprinted in AMAZING SPIDER-MAN ANNUAL 6 , Nov 1969 https://readallcomics.com/amazing-spider-man-v1-annual-006/ )




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"Love and kisses, Susan Richards" lol
from FF 238, Jan 1982
https://readallcomics.com/fantastic-four-v1-238/



And ...

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Namor, just being Namor.

From FF 261, Dec 1983.
https://readallcomics.com/fantastic-four-v1-261/