The Mona Lisa, painted by Leonardo da Vinci between 1503 and 1506, is a renowned portrait of Lisa Gherardini that resides in the Louvre Museum. Art historians have debated the painting's dating, with some asserting it may have been refined as late as 1517. Additionally, there are discussions about an alternate version called the Isleworth Mona Lisa, which has similarities but also notable differences in composition and quality.

2. The Mona Lisa
The Mona Lisa (Monna Lisa or La Gioconda in Italian; La Joconde
in French) is a half-length portrait of a woman by the Italian
artist Leonardo da Vinci, which has been acclaimed as "the best
known, the most visited, the most written about, the most sung
about, the most parodied work of art in the world". The painting,
thought to be a portrait of Lisa Gherardini, the wife of Francesco
del Giocondo, is in oil on a white Lombardy poplar panel, and is
believed to have been painted between 1503 and 1506,
although Leonardo may have continued working on it as late as
1517. It was acquired by King Francis I of France and is now the
property of the French Republic, on permanent display at The
Louvre museum in Paris since 1797.

4. History of Mona Lisa
Leonardo da Vinci began painting the Mona Lisa in 1503 or 1504
in Florence, Italy. Although the Louvre states that it was
"doubtless painted between 1503 and 1506", the art historian
Martin Kemp says there is some difficulty in confirming the
actual dates with certainty. According to Leonardo‘s
contemporary, Giorgio Vasari, "after he had lingered over it four
years, left it unfinished". Leonardo, later in his life, is said to have
regretted "never having completed a single work". In 1516
Leonardo was invited by King François I to work at the Clos Lucé
near the king's castle in Amboise. It is believed that he took the
Mona Lisa with him and continued to work after he moved to
France. Art historian Carmen C. Bambach has concluded that da
Vinci probably continued refining the work until 1516 or 1517.

5. The Mystery of Mona Lisa

6. 10 Worst Things That Happened To The Mona Lisa

7. Isleworth Louvre

9. Isleworth’s Mona Lisa
The Isleworth Mona Lisa is wider than the Mona Lisa in the Louvre,
having columns on either side which also appear in some other
versions. The Louvre painting merely has the projecting bases of
columns on either side, suggesting that the picture was originally
framed by columns but was trimmed. However, experts who examined
the Mona Lisa in 2004–2005 stated that the original painting had not
been trimmed. The figure of the Isleworth Mona Lisa closely resembles
that of the Mona Lisa, being identically composed and lit. However,
the face of the Isleworth Mona Lisa appears younger, leading to
speculation that it is an earlier version by the artist. According to
Pulitzer, multiple art experts agreed that the neck of the Isleworth
Mona Lisa is inferior to the necks of other Leonardo subjects.
Furthermore, the background in the Isleworth painting is considerably
less detailed than the background in the Louvre painting. For these
reasons, several people Pulitzer consulted believed that the hands and
face of the portrait were done by Leonardo, but the rest may have
been finished by another or others.