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In my opinion, the most important advice:
Art has a rational component which we can call the 'technique' or 'craft' of the field. In drawing this would be light/shade, perspective, texture, drawing material etc. but it also has an intuitive component that results from developing an aesthetic sense. It is important to realise that art is not learned just from painting but by seeing the world through a painters eyes. Observing the world and understanding the way the eye perceives it and the mind reproduces it.