Mona Lisa (1503–1506), 77×53 cm, oil on panel, Musée du Louvre, Paris. This mysterious portrait is the world's most famous and captivating painting, a masterpiece by Renaissance master Da Vinci at his mature Florentine peak. The noblewoman in the painting is named Mona Lisa, a native of Florence who married local wealthy man Del Giocondo in 1495. Under Da Vinci's superb technique, she became the quintessential example of the finest Renaissance portraiture.

Why is this painting so captivating? Why does it possess such profound charm? Look at her wise yet amiable eyes, and that charming, ethereal smile with its enigmatic allure, which gives people a sense of warmth. Is not this knowing smile the deepest manifestation of human inner spirit? Most wonderfully, no matter from what angle one views her, her sparkling eyes and bewitching smile seem to stare back at us, as if engaging in a vivid dialogue. Could this be female mystery? It strongly leaves a deep impression and rich associations on viewers.

Furthermore, her elegant face, graceful posture, transparent black veil over her head, and two strands of long hair naturally draped over her shoulders are striking. Her chest below the neck is exposed, soft and full; she wears a generous black velvet dress with a soft texture, devoid of any flashy decorations. Her gentle, voluminous hands are lightly folded, natural and serene. Here, Da Vinci captures profound emotion. Particularly through the hazy, atmospheric sfumato technique, he vividly presents distant mountain landscapes. Thus, the human outline dissolves into light and shadow, filling the canvas with tranquil air. Through chiaroscuro and aerial perspective, he presents a vast, distant space to embody this eternal smile.

Sir Kenneth Clark wrote: "The smile of the Mona Lisa is the best model for understanding the source of inner life." In a 16th-century essay on female beauty, Firenzuola also wrote: "Lips slightly parted were considered by people at that time as a symbol of female elegance; therefore, Mona Lisa's smile became the standard for flawless Renaissance women."