Here's a gallery of photos from past Comic-Cons in San Diego. I was at every one of these events. The one of Shel Dorf that's captioned as him with a drawing of the Fantastic Four is wrong. That's a drawing of a different Jack Kirby cast of characters, the Forever People.
Shel, by the way, liked to decorate the early cons with these posters he made up. He would project an image from some comic book or strip on a big piece of paper and then, using a brush and ink, he would trace the image onto the paper. Several of those tracings wound up in private hands and every so often, someone contacts me to ask if what they have is really a piece of Jack Kirby or Charles Schulz original artwork. I have to break it to them gently that no, it's not that.