This is a personal project.
The workflow was basicaly the same except the face texturing, I used projection from photos and completed it in Mari.
I sculpted a blocking it in Zbrush from a basemesh and projected alphas from XYZ for details. There is no rigg on him, just a blendshape for the other expression.
Rendered in maya/Vray. The hair was made with Ornatrix and global texturing in Substance Painter. I used Marvelous for the clothing including the hat.
The main objective was to represent the Joker from Allan Moore's "The Killing Joke" comic book as a rbelievable character without denature the original design. It was very challenging to make him more disturbing/creepy/mad and not ridiculous. I used a lot of references from particular actor faces to make his expression credible. . It is not perfect but I am happy with it.
I hope you will like it !