I haven't reposted this in years, but the artist Carson Van Osten created this handout years ago when he was drawing Disney Comics (I briefly worked with Carson when I did a short stint at Disney Consumer Products). I think most of it is printed in Frank and Ollie's book, "The Illusion of Life".
Carson's handout is a great primer on common mistakes made in comic book design and layout. I posted some xerox copies of it years ago and it got a bit of attention on other websites. Carson heard about it and contacted me, and eventually he sent me an original, higher res version of the whole thing, which I scanned and posted (you can see his hand-written note to me on the first page). All of his thoughts are great and have really stuck with me over the years and saved me hours of frustration.
Legendary Comic Artist Wally Wood did a piece that shows up everywhere on the web entitled "22 Panels That Always Work".
"Ben Day" refers to, they were transparent sheets with dots on them that comic artists would cut and lay onto panels to create grey tones or colors.
I always cringe when I think about this last great comic resource, because it's a brutal critique of Steve Rude's work by the great Alex Toth. Apparently Rude asked Toth to critique a "Johnny Quest" story and Toth did so, writing all his notes in the margins. Toth was a legendary curmudgeon and didn't bother to hide his clear scorn of Rude's work. I don't like posting it because it takes a lot for any artist to open himself up for such criticism and I doubt Rude knew it would become so public. But it's such a great glimpse into the mind of Toth and what made his work so great that I think it has a lot of value.
I reposted these images from this forum.