Having lived in many countries and been exposed to different cultures, I am always keenly aware of how courtesy and consideration to others are valuable passports in life. In the art world, I believe it is vitally important, basically to say "please" and "thank you".
One of the early, stellar examples of an artist who was gracious and noted for his courtesy was Raphael Sainzo of Urbino, the Renaissance artist who was famed both for his paintings and his drawings. (At right, The Phrygian Sibyl for the Chigi Chapel in S. Maria del Popolo in Rome.) Raphael was endowed by "nature with the goodness and modesty to be found in all those exceptional men whose gentle humanity is enhanced by an affable and pleasing manner, expressing itself in courteous behaviour at all times and towards all persons" (History of Art: the Western Tradition. Horst Woldenmar Janson, Anthony F. Janson). Giorgio Vasari noted that Raphael was very skilled in running a harmonious and efficient workshop full of apprentices and was extremely diplomatic in relationships with both his patrons and his assistants. Clearly Raphael was an artist with whom people enjoyed working and who was esteemed for his skill and his pleasant demeanour. He gave every artist a wonderful example to follow.