Below is research and sketches relating to the characters needed in the movie.

The four snapshots above are present day and historical pics. The third character 'Jokerface' I'd like to have an angry version as well. For the first and fourth characters I'm hoping to find the right actors, so make-up can be minimal - maybe just a plastic shine on their face over the make-up (I also want 'Infant Clown' to be cute, the first photo is hideous - something more like the rough doodle (below left) would be an improvement.

Below is the exhibit where Laughing Man and Infant Clown perform.

The three characters with numbers on their chests (see top sketch) - I liked the idea of their heads to be like small bean bags, the kind you knock off with a ball at a stall to win prizes. I found draw-string hessian sacks online, which could make for an interesting effect when turned upside down.