Mona Lisa is always happy… Several experts from art and history of art have discussed the fascination that emanates from da Vinci'
: Da Vinci’s goal was to reveal the subject’s soul, a daring move at a time when most portraits were stiff and profile-based.
Mona Lisa is always happy – and only sometimes sad | Scientific Reports
: Using the sfumato technique, Leonardo created edges that are never fully defined, making her smile appear to change depending on your viewing angle .