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[Linked Image from i.pinimg.com]

The second with ( think pretty clearly) Byrne layout. The airbrushing and colors really bring both of these to perfection.



Here's a page that shows the X-MEN, SPIDERMAN, and later 1982 second X-MEN portfolios. The 4 images in the last one I didn't like as much as the first X-MEN portfolio.
https://www.popculturesafari.com/2016/10/comic-art-marvel-comics-portfolio-art.html?spref=pi

Here's the cover for the X-MEN portfolio :
https://pictures.abebooks.com/inventory/22658677986.jpg