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[Linked Image from i.pinimg.com]

This looks like a convention sketch by Steve Lightle. Or maybe an unused cover.



[Linked Image from i.pinimg.com]

And this cover from X-MEN CLASSIC 52, another sampling from Lightle's wwork on the Marvel side of the fence.

Lightle did covers and inside-cover illustrations on issues 30-42, 44-52, and 56.
https://www.mycomicshop.com/search?TID=97241

https://viewcomiconline.com/classic-x-men-issue-30/ ( titled CLASSIC X-MEN, issues 1-45 )
https://viewcomiconline.com/x-men-classic-issue-52/ ( titled X-MEN CLASSIC, issues 46-up )

At the latter viewcomic links, you can view each cover in a larger size, and also the inside-cover illustraions by Lightle, that in many cases are as nice, or nicer, than the covers by Lightle.