Roy Fox Lichtenstein ( October 27, 1923 – September 29, 1997) was an American pop artist. During the 1960s, along with Andy Warhol, Jasper Johns, and James Rosenquist among others, he became a leading figure in the new art movement. His work defined the premise of pop art through parody. Inspired by the comic strip, Lichtenstein produced precise compositions that documented while they parodied, often in a tongue-in-cheek manner. His work was influenced by popular advertising and the comic book style. His artwork was considered to be "disruptive". He described pop art as "not 'American' painting but actually industrial painting". His paintings were exhibited at the Leo Castelli Gallery in New York City. - Wikipedia
Repin was the leading artist in the Russian Realist movement in the late 19th century. He was born in the Ukraine, and started as an icon painter. From 1864 to 1873 he studied at the Academy of Fine Arts in St Petersburg. From 1873 to 1876 he was in Paris, where he was influenced by Delacroix and plein-air painting. In 1878 he joined the Wanderers (Peredvizhniki), a group of artists concerned with the realistic depiction of Russian life and history. He painted genre and historical subjects, and portraits of leading figures of the time.