Question: Who was the Mona Lisa painted by?
About the article "Mona Lisa", section "Abstract".

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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, suggesting that somebody else touched up the neck.
Several people Pulitzer consulted believed that the hands and face of the portrait were by Leonardo, but the rest may have been finished by another or others.
The background in the Isleworth painting is considerably less detailed than the background in the Louvre painting, causing many art experts cited in Pulitzer's book to suggest that if Leonardo did indeed paint the subject, it is likely somebody else painted the background. 
  Monna Vanna, by Dante Gabriel Rossetti (1866)  Dante and Beatrice", by Henry Holiday (1864)  "Monna Vanna", a nude version of the "Mona Lisa" painted by Salaì (Gian Giacomo Caprotti da Oreno), a pupil of Leonardo da Vinci.
("Monna" was the Renaissance title for "Lady", e.g., Mona Lisa, Monna Vanna).  
Lisa del Giocondo (; née Gherardini ; 15 June 1479 – 15 July 1542 or ca.
1551), also known as Lisa Gherardini, Lisa di Antonio Maria (or Antonmaria) Gherardini and Mona Lisa, was a member of the Gherardini family of Florence and Tuscany in Italy.
Her name was given to "Mona Lisa", her portrait commissioned by her husband and painted by Leonardo da Vinci during the Italian Renaissance.
Little is known about Lisa's life.
Born in Florence and married in her teens to a cloth and silk merchant who later became a local official, she was mother to five children and led what is thought to have been a comfortable and ordinary middle-class life.
Lisa outlived her husband, who was considerably her senior.
Centuries after Lisa's death, "Mona Lisa" became the world's most famous painting and took on a life separate from Lisa, the woman.
Speculation by scholars and hobbyists made the work of art a globally recognized icon and an object of commercialization.
In 2005, Lisa was definitively identified as the model for the "Mona Lisa". 
Two nude paintings bearing similarities to Leonardo da Vinci's original were part of a 2009 exhibition of artwork inspired by "Mona Lisa".
Displayed at the Museo Ideale in Leonardo's hometown of Vinci, near Florence, some believe one of the paintings – dating from Leonardo's time – to be the work of Leonardo himself, and it has at times been credited to him.
Other experts theorize the painting, one of at least six known to exist, may be just another copy painted by "followers" of Leonardo.
Scholarly dispute persists as to artist, subject and origin.
The nude in question, discovered behind a wall in a private library, reportedly belonged to an uncle of Napoleon Bonaparte, who owned another of Leonardo's paintings.
Facial features bear only vague resemblance, but landscape, compositional and technical details correspond to those of the "Mona Lisa" known worldwide today.
A student and companion of Leonardo da Vinci known as Salaì painted one of the nude interpretations of "Mona Lisa" known, titled "Mona Vanna".
Salai's version is thought by some to have been "based on" the nude sometimes attributed to Leonardo, which is considered a lost work.
Discussion among experts exists as to whether Salai, known to have modeled for Leonardo, may in fact have been the sitter represented in the original "Mona Lisa".
Joos van Cleve, a Flemish artist active in the years following "Mona Lisa"'s creation, also painted a nude titled "Mona Vanna".
Though the figure portrayed in van Cleve's painting bears no resemblance to Leonardo's "Mona Lisa", the artist was known to mimic themes and techniques of Leonardo da Vinci, in this case the positioning of the figure and the delicate brushwork reminiscent of Leonardo's sfumato.
The artwork, dating to the mid-16th century, is in the collection of the National Gallery, Prague. 
The Abomination.
"The Abomination" is a fifteenth-century painting by Giuseppe Di Cattivo.
The painting was considered too terrifying to be seen.
The paint used contained a mineral that hosted an alien organism.
Once in close proximity to the Mona Lisa (painted with the same mineral paint), the Abomination and Mona Lisa came to life.
The painting of the Abomination was stored in a vault that required a complex puzzle key to open it.
When Mona Lisa came to life, she sought the key to release the Abomination.