I wished to copy nature. I could not. But I was satisfied when I discovered the sun, for instance, could not be reproduced, but only represented by something else.
Treat nature by the cylinder, the sphere, the cone, everything in proper perspective so that each side of an object or a plane is directed towards a central point.
See how the light tenderly love the apricots, it takes them over completely, enters into their pulp, light them from all sides! But it is miserly with the peaches and light only one side of them.