@farmerman,
There was the documentary,
The Mystery of Picasso (1956), which showed the artist actually creating his works.
And there was,
Surviving Picasso (1996), a Merchant-Ivory production with Anthony Hopkins as Picasso.
And Picasso was a character in the dreadful,
Modigliani.
Quinn played Gauguin in the movie about Van Gogh,
Lust for Life.