Tina Charad, a movie graphic designer and illustrator, shared some work she did for Suicide Squad early on in the pre-production phase. The concept of tattoos for The Joker and Harley Quinn were there from the beginning, but they looked very different at one point.
For example, we get to see Jared Leto in an early costume test without “Damaged” tattooed across his forehead. Instead, he has tattoos where his eyebrows should be. Harley Quinn had a completely different set of tattoos as well. And we get to see a bunch of outfits for The Joker that didn’t make the final cut.