Sava Sumanovic (896-1942) was a Serbian painter considered to be one of the most important Serbian painters of the 20th century. His styles ran from Cubism, Fauvism, and Expressionism.
I have been to his home and museum in the town of Sid (SHEED), located about an hour and a half from Belgrade. The painting above I recently saw again at a museum exhibit here in Belgrade where I had taken my grandchildren to culture them up more than they already are. :)
Sadly, Sava Sumanovic was executed during the mass genocide of Serbs during WWII in Croatia. He was first tortured, then thrown still alive into a lime pit.