The power of sfumato, the blending of colours or tones so that there is no perceptible transition, was used by Da Vinci and Gerhard Richter to represent an idea of female beauty and the expanse of a seascape, respectively.
The power of outlining was used for a variety of seemingly conflicting presentations of subtlety/lightness by Botticelli, surrealism/playfulness by de Chirico and abstractness/stark purpose by Braque.
Sandro Botticelli, Primavera, c.1482
Giorgio de Chirico, Hector and Andromache, 1917
Can you help me to understand these technique or their purpose better?