One of Mexico's Finest Painters - David Alfaro Siqueros
When you mention Mexican painters, most first think about Diego Rivera, and clearly he is one of the finest artists of the 20th Century, but another Mexican, David Alfaro Siqueros, also created a significant [an underappreciated] body of work. He was quite political like Rivera and influenced Frida Kahlo's work. See some of his best below.

Proletarian Mother, David Alfaro Siqueiros · 1929

The Child Mother, David Alfaro Siqueiros · 1936

The Sob, 1939

Head of a Woman, 1936