What are the characteristics of the portrait of Swedish painter Zon?

Zon is good at grasping the instantaneous emotional changes of the characters in his works and can express them quickly. His representative portraits include Mrs Gardner, Rodin, Grandpa Anders and Mother. His portraits not only depict delicate feelings and personality, but also show his superb attainments in artistic skills, especially in color language. He was influenced by the light and color characteristics of French Impressionism, but he adopted a stronger and simpler expression. He doesn't like to use too many colors, but because of the proper contrast, it looks thick and loud, and even feels the light shaking.