Having read two books this year on Diane Arbus, I intend to see the movie.
I also thought the choice of Nicole as Diane, was interesting, to say the least. In fact, my first thought, was that her sister, Antonia, would have been a much better choice, as far as looks goes. She is a natural light brunette, as opposed to her light redheaded sister.
Antonia is also quite an accomplished actress, television presenter etc, in her own right, in this country.