Kathe Kollwitz. The Mothers, 1922.
She is a gleaming outlier. She paved the way to German expressionism but was a generation or two before it took off. She was concerned with peasants and justice and is remembered for profound grief, having been born in just the moment to lose a child in WW1 and then die herself during WW2. Obviously her worldview was not sanguine. I am sorry to be so doom-y, but we must not shy away from what her work has to tell us now.