You are right about that, however I dont think they will make THAT MUCH of an effort to completely change how they take pics and their material to keep their identity a secret :lol
By the way the good news is that the artist will probably start in another 10 days or so. So I would like a request from you guys.
Flood this thread with pics (preferably with no lens distortion which can falsify actual proportions) with reference pictures of Ledger Joker in a neutral expression. I will use some of them with the screenshots I pull from the film and other relevant material to send over to the artist. All this can help go a long way in making this sculpt a definitive one.