Sfumato

In painting, the application of subtle layers of translucent paint so that there is no visible transition between colors, tones and often objects.
 * __Sfumato__:**

needs a better image... previous one showed chiaroscuro but not sfumato. you need to show entire mona lisa artwork in order to see the sfumato.

Sources?

Mona Lisa, 1503-1505, oil on wood. Louvre, Paris