Better known as a model but an excellent painter in her own right, Suzanne Valadon posed for artists including Renoir, Toulouse-Lautrec & Modigliani. The portrait of Lily Walton and its almost degas-esque quality is a beauty.
Portrait of Miss Lily Walton avec Raminou (1922)
The Bath (1908)
Photograph of Suzanne Valadon
Here's some of her more famous appearences...
Renoir - Dance at Bougival
Renoir - Girl Braiding her hair
Henri Toulouse-Lautrec - The Hangover
here's a brief bio from artblogbybob