Andy Warhol painted soup cans. Picasso painted naked women. Degas painted dancers and Dalí painted soggy clocks. From this we can surmise that Warhol liked soup, Picasso liked women, Degas liked ballet, and Dali was often late. We can also surmise that if you want to be a great painter you need to be passionate about something. In other words, paint what you know and know what you paint.