This image burned my brain when I was a little kid...
I think it's one of the reasons I decided to become a cartoonist. I first saw this image in Jim Steranko's History of Comics book, and I remember begging my parents to buy the book for me at the Pickwick bookstore when I was about seven years old.
For full impact, you gotta see it BIG
This is just one of thirteen gorgeous comic book pin-ups specially commissioned for the Jim Steranko Calendar for 1971. See the whole thing in high-resolution at the Golden Age Comic Book Stories blog.