The Kirby Museum was proud to have received some photos from then-Trustee Lisa Kirby of the 1976 backstage meeting of Paul McCartney and Jack Kirby.
Unfortunately, there are some that believe that McCartney hired Kirby to produce the artwork that appeared on stage during the performance of “Magneto & Titanium Man” during that tour.
This is the same artwork that was used as a record sleeve:
I found the sources for this image:
So, there you have it. The source images are, from left to right, by George Tuska & Mike Esposito from Iron Man 22 (February 1970, on sale December 1969) , George Tuska & John Tartaglione from X-Men 91 (December 1974, on sale October 1974) and Sal Buscema & Joe Staton from Avengers 130 (December 1974, on sale October 1974).
Any of these three comics may very well have been some of those that kept McCartney “from going bonkers” by “keeping their kids entertained”1 in Jamaica while he was writing, as McCartney described the genesis of the song. The “Venus and Mars” album on which the song appears was recorded November 1974 – March 19752. Or the comics just may have been those available to the artist who pulled the backdrop together.