The Beautiful Troublemaker (J. Rivette, 1991)

A reclusive famous painter, Frenhofer (Piccoli), lives quietly with his wife and former model (Birkin) in a rambling château in rural Languedoc-Roussillon. When a young artist visits him with his girlfriend, Marianne (Béart), Frenhofer is inspired to commence work once more on a painting he long ago abandoned — La Belle Noiseuse — using Marianne as his model. The film painstakingly explores Frenhofer’s creative rebirth. It uses lengthy real-time takes of the artist’s hand (provided by Bernard Dufour) working on paper and canvas.

(Source : en.wikipedia.org)