Behind the door ( Navigli, Milan )

If one is teacher , dentist or accountant measure of success is not how she/ he is original, but for the artists origanlty , talent distinct voice is often more important than how much money they make. So what do street artists selling their ware to tourist think of them selves ? Pushing same of similar painting all the time, cityscapes, works resembling more famous paintings or trompe-l’oeil books shelved in the library like this one. He has craft, and makes some money but what does he think behind the doors is this why he became painter