In 1888, he enrolled in the École des Beaux-Arts, and soon began frequenting the Académie Julian where Maurice Denis and other students formed the group Les Nabis.
[1] In 1899, Roussel, Vuillard, and his close friend, Pierre Bonnard, travelled to Lake Como, Venice, and Milan.
He drew his subject matter from the area around L'Étang-la-Ville and Saint-Tropez, adapting the scenery to Greek mythological episodes depicting women, children, nymphs, centaurs and fauns.
His wife Marie (Vuillard's sister), his daughter Annette, his son Jacques and his grandchildren served as models.
He abandoned the small format pictures typical of the Nabis and created large, brightly coloured paintings in a post-impressionist style.