It is all very well to copy what one sees, but it is far better to draw what one now only sees in one's memory. That is a transformation in which imagination collaborates with memory.
What use is my mind? Granted that it enables me to hail a bus and to pay my fare. But once I am inside my studio, what use is my mind? I have my model, my pencil, my paints. My mind doesn't interest me.
A picture is first of all a product of the artist's imagination, it must never be a copy.
A painting is above all a product of the artist's imagination, it must never be a copy. If, at a later stage, he wants to add two or three touches from nature, of course it doesn't spoil anything.