Pierre-Auguste Renoir, the Impressionist painter and his The Bohemian (Lise the Bohemian), En été (La Bohémienne) created in 1868.
I particularly enjoyed this definition by George Sterling, a member of the exclusive Bohemian Club, a club that also included the likes of Clint Eastwood, Dwight D. Eisenhower, Henry Ford:
Any good mixer of convivial habits considers he has a right to be called a Bohemian. But that is not a valid claim. There are two elements, at least, that are essential to Bohemianism. The first is devotion or addiction to one or more of the Seven Arts; the other is poverty. Other factors suggest themselves: for instance, I like to think of my Bohemians as young, as radical in their outlook on art and life; as unconventional, and, though this is debatable, as dwellers in a city large enough to have the somewhat cruel atmosphere of all great cities.