I want to make it super clear (although the site takes pains to not): this comic wasn’t written/illustrated by McCloud. It was created by the person with the “Leah” handle.
Robert Horn's `Visual language: global communication for the 21st century` is another great one!
https://en.wikipedia.org/wiki/Understanding_Comics
Even if you don't like comics, it is an incredible take on how the brain processes images. Comics are art, more than anything else, about humans. And, this book is a work of art itself because it explains in detail how humans process images of other humans. I cannot recommend it enough.
And, if you are a computer scientist it provides an additional definition for closure, which was surprising to me.