It is not a question of trying to reproduce objective features, only of good practice for the fingers and for the perceptive faculty, and that too is very useful. You must have read how Van Gogh was always getting his brother to send him drawings to copy. And how Rembrandt used to copy Indian an Italian pictures. Not of course, because they were short of material, but to get 'du corps'. So one should be always drawing... ...Oh, you’d love the Indians. The pure, Aryan Indians, not those one could see in Berlin, whose forms had become rigid and sterile through mingling with the Chinese.
Ernst Ludwig Kirchner, letter to Nele van de Velde, Frauenkirch, 1919/20, in Letters of the great artists – from Blake to Pollock, Richard Friedenthal, Thames and Hudson, London, 1963, pp. 224–225.