This handsome fellow is Arthur Cravan (1887-1918?), real name Fabian Lloyd, an artist, poet and pugilist.
A giant of a man, described by his wife, the poet Mina Loy, as looking like something that had escaped from the British Museum, he cut a striking figure through bohemian Paris and the Dadaist circles in New York. By marriage, he was Oscar Wilde’s nephew, and once caused such a transcontinental stir when he claimed that Wilde was alive and had visited him in Paris, that New York papers sent journalists to Paris to interview him. He was a terrible boxer, though he once fought with the then world champion Jack Johnson - he was promptly knocked out.
Cravan married Mina Loy in Mexico in 1917, where they lived in poverty for some months before resolving to relocate to Argentina. Having only enough money for passage for one, they resolved that the pregnant Loy would go on the ship, and Cravan would travel in a sailboat of his own construction. He never arrived, and is presumed drowned. Theories abound as to what may have happened to him - many of his friends believe he would turn up eventually, in another country with a new girlfriend speaking her language, as he had done that before - but nothing is known for certain, and his biographers typically presume him dead. His wife gave birth to their child, a girl, named Fabienne after her father.