Take a look at Why So Serious? The Many Faces of Joker, with images spanning from the first comic book to feature the character in 1940 to Heath Ledger in The Dark Knight. This one is from the 1988 graphic novel The Killing Joke. Link
Bonus: Here’s an image of the even earlier character who inspired the creation of The Joker. http://www.transbuddha.com/content/the-man-who-laughs/
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