When I first started getting/buying my own comics (which would be closer to the end of 1973/beginning of 1974) I used to make my own comic books. As part of those books, I'd often glue in the corner boxes I'd snipped from my comics. It didn't take long until some friends of mine, who had older brothers, recommended that I desist in that habit. I had been educated!
A fun pasttime with any sort of stock art is to try to determine who the artist was. If you know, or have some solid guesses, why not post them in a comment below?
In our first row, you'll see cover art from Tomb of Dracula, Mighty Thor, Uncanny X-Men (during the reprint era), and Werewolf By Night. I've always liked the regality of this Thor image.