Mona Lisa replicas and reinterpretations
After restoration, the Prado's "Mona Lisa" revealed details covered by previous restorations and layers of varnish.
Furnishings and fabrics were enhanced, as well as landscape and facial features.
It is anticipated that such revelations may offer further insight into Leonardo's original.
Experts at the Louvre reportedly supported the Prado museum's findings.
The Prado replica was subsequently transported to the Louvre in 2012 to be displayed next to "Mona Lisa" as part of a temporary exhibition.
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.
George Pusenkoff
Leonardo da Vincis masterpiece Mona Lisa has become part of our cultural memory and has inspired many artists of the 20th century to create their own works with the painting. George Pusenkoff also dealt with the Mona Lisa. In 1993 he painted his first work with an image of the Mona Lisa. Its title is "said Duchamp". Since then, he has repeatedly worked with the image of Mona Lisa, to an extent as no other artist before him:" For Pusenkoff, the Mona Lisa has become his female alter ego, an iconic representation of his own artistic identity."In 1995 George Pusenkoff was sued by the photographer Helmut Newton because he saw in a work of art by Pusenkoff "Power of Blue" a (unauthorized) derivative work of one of his photographs entitled "Miss Livingstone I, Beverly Hills, 1981". Newton argued that Pusenkoff's artwork resembled his work in its critical components so much that it was plagiarism. The Copyright law of Germany clearly regulates in §24 that an "independent" work created in "Fair use (in German "freie Benutzung") of another's work" may be exploited without the author's permission. Pusenkoff referred to this norm. The court now had to decide whether the picture "Power of Blue" was to be regarded as an adaptation or a "fair use". The black and white photography of Helmut Newton shows a female nude from the front, sitting on a folding chair. The background is white, right and left the surroundings can be seen in outlines. The woman sits with her legs widely spread on the chair, one leg bent so that her genitals are clearly visible, and radiates self-confidence. The woman's face is recognizable and at the edge of the photo a stylized, yet recognizable, environment is visible. George Pusenkoff's work, on the other hand, is colored - in the typical deep blue tone quoted from Yves Klein. The nude itself is recognizable only as a silhouette. A yellow square covers the woman's shame and reaches up to her knee. The yellow square is to be understood as a reminiscence of Kasimir Malevich.