And here’s Sean’s write-up for the image, which I find fascinating.
Jack Kirby Photographed in the Marvel Offices, 1966
Along with this other shot, the above photograph of Kirby is a rare glimpse of the Marvel offices of the 1960s. It includes many Marvel Comics (or cover proofs of about-to-be-published Marvel Comics) cover-dated in June and July 1966. (Again, the cover dates of comics at the time were roughly three months ahead of the publication date.)
It’s possible that the other photograph, of Kirby with original art for Tales of Suspense #76 (cover date April 1966) was taken at a later date than that prop would suggest, and that he’s simply pretending, for the camera, to work on a finished-long-ago inventory page. (Why would he be coming into the office in a suit to touch up the inks on a cover?)
Maybe they were taken on the same day?