Portrait painting by Alex Katz, LeadArt oil painting just do reproduction of them in museum quality on linen canvas:

Alex Katz (born July 24, 1927) is an American figurative artist associated with the Pop art movement. In particular, he is known for his paintings, sculptures, and prints and is represented by numerous galleries internationally.
Alex Katz was born in Brooklyn, New York. In 1928 the family moved to St. Albans, Queens. From 1946 to 1949 he studied at The Cooper Union in New York, and from 1949 to 1950 he studied at the Skowhegan School of Painting and Sculpture in Skowhegan, Maine. Skowhegan exposed him to painting from life, which would prove pivotal in his development as a painter and remains a staple of his practices today. Katz explains that Skowhegan’s plein air painting gave him “a reason to devote my life to painting.” Katz has admitted to destroying a thousand paintings during his first ten years as a painter in order to find his style. Since the 1950s, he worked to create art more freely in the sense that he tried to paint “faster than [he] can think.”His works seem simple, but according to Katz they are more reductive, which is fitting to his personality.