If you haven't read Batman #13, then shame on you.
I had to make this new Joker. In the story, the Joker went missing for a year after another villain sliced his face off. He returned to claim his skin and has been wearing it as a mask, along with a "Joe's Garage" jumpsuit he apparently stole.
The recipe is a killing Joke Joker upper half, with legs from DCUC Question.
Under the mask is actually a Spawn head, which was based on Greg Capullo's art. I wanted to get it as authentic as possible, so I sculpted the hair, ears, and face over the Spawn head...