There was no script per se. The film was shot in sequential order and the day's shooting was dictated by what had been filmed the day before.
Shortly before his death, legendary Japanese director Akira Kurosawa named La belle noiseuse as one of his 2 favorite movies made in the 1990s (the other being Fireworks by Takeshi Kitano), calling it the best filmed display of a struggle of an artist doing his craft and a cinematic piece he would have liked to direct himself.
The picture in the film is drawn by the hand of the artist Bernard Dufour.
The frank and extensive nudity Emmanuelle Béart did in this film seemed to extract a heavy toll on her, so much that she admitted in an interview that, ever since the release of this film back in 1991, she had been able to draw the courage to view La Belle Noiseuse in its entirety only once, which was hinted to be at the time of its premiere back in 1991 Cannes Film Festival.
Reportedly, around 75% of the shooting schedule was dedicated to film Emmanuelle Béart's very lengthy nude scenes.