The chief function of color should be to serve expression as well as possible.
What interests me most is neither still life nor landscape, but the human figure.
A thimbleful of red is redder than a bucketful.
When I put a green, it is not grass. When I put a blue, it is not the sky.
When a painting is finished, it's like a new born child, and the artist himself must have time for understanding. How then do you expect an amateur to understand that which the artist dos not yet comprehend.
Color was not given to us in order that we should imitate Nature. It was given to us so that we can express our emotions.