Pierre-Auguste Renoir
"Auguste, the Novice" (1841-1919), found in Montmartre. One of the most recognized painters, he was a founder of Impressionism alongside fellow artist and friend Monet. His art is widely celebrated today. He held his first art exhibit in 1864, but fame did not come until the 1870s.
He had an affair with Suzanne Valadon while she was modeling for him. He eventually married Aline Victorine Charigot and fathered three sons, including renowned film director Jean Renoir. He travelled extensively from 1881-1882, seeking out a number of cultural icons, including the German composer Wagner.
Great Artists in History - Pierre-Auguste Renoir
WebMuseum, Paris - Renoir, Pierre-Auguste
Wikipedia - Pierre-Auguste Renoir
 
Wladyslaw Szpilman
"Szpilman, the Pianist", found in Montmartre. Like Dali, this is likely a tribute reference due to the time frame of Szpilman's life (1911-2000). He was a Polish pianist who worked for radio until World War II, when his family was forced to live in the ghettos due to their Jewish background. He eventually made his way back to Warsaw, capital of Poland.
He became famous for his compositions, as well as for his survivor memoir Smierc Miasta (Death of a City). Censored by the Communist government, it reappeared in English in 1998 under the title The Pianist. From these writings, the movie of the same name (2002) was made.
Wikipedia - Wladyslaw Szpilman
 
Marc Chagall
"Chagall, Who Stinks of Ink" (1887-1985), found in Petrograd, and also a trader in the Straw Millionaire sidequest. Born Moishe Zakharovich Shagalov, this Jewish artist was an important figure in Surrealism. Tension with his father sent him to St. Petersburg, Russia. After becoming established, he moved to Paris to participate in the growing artistic community.
He returned to Russia in 1914, and soon married Bella Rosenfield and had a daughter, Ida; during this time also became involved with the Russian Revolution. He was appointed Commissar of Art for the Vitebsk region by the Soviet Culture Minstry, but he was unable to work under the Soviet system. He left for Moscow, then finally returned to Paris until he had to flee France due to the Nazi presence in World War II.
Great Artists in History - Marc Chagall
Wikipedia - Marc Chagall
Artcyclopedia - Marc Chagall