"La Belle Ferroniere"
A portrait of Lucrezia Crivelli?

 This is reported to be a portrait of Ludovico Sforza's mistress Lucrezia Crivelli, however the identity of the sitter is by no means certain.

 La Belle Ferroniere was the nickname of a mistress of Henry II of France, and it is possible that the painting could be Isabella of Aragon.

 It is known that Leonardo painted a portrait of Lucrezia Crivelli and it is likely that this is that picture.

La Belle Ferroniere 1485.
Oil on wood panel, (63x45cm) Louvre, Paris. (s)

The ferroniere is the decorative band around the head, a fashionable accessory of the time.

Personal Opinion:-

Look at the direct gaze of the sitter. It suggests a relationship between The subject and the viewer, this adds personality to Lucrezia, she seems very human and quite vulnerable.
It has been suggested that this work could be by Giovanni Antonio Boltraffio, Leonardo’s pupil, but the modeling of the face is pure Da Vinci.

A beautifully executed portrait!