Matisse's The young sailor and the Fauves

Matisse painted the 18 years-old  fisherman Germain Augustin Barthélémy twice in 1906.
The left one is the second version:  the contours have been sharpened, the forms are more defined, and the colors have been reduced to large, mostly flat areas of bright green, blue, and pink.
The three dimension at this painting is still suggested.
Matisse had already started painting in the Fauve in 1905:

"Fauve painting is not everything, but it is the foundation of everything."
Henri Matisse