Mona Lisa
Leonardo da Vinci is thought by some to have begun 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 are some difficulties in confirming the actual dates with certainty. In addition, many Leonardo experts, such as Carlo Pedretti and Alessandro Vezzosi, are of the opinion that the painting is characteristic of Leonardo's style in the final years of his life, post-1513. Other academics argue that, given the historical documentation, Leonardo would have painted the work from 1513. According to Leonardo's contemporary, Giorgio Vasari, "after he had lingered over it four years, [he] left it unfinished". Leonardo, later in his life, is said to have regretted "never having completed a single work".
Circa 1504, Raphael executed a pen and ink sketch, today in the Louvre museum, in which the subject is flanked by large columns. Experts universally agree it is based on Leonardo's portrait of "Mona Lisa". Other later copies of the "Mona Lisa", such as those in the National Museum of Art, Architecture and Design in Oslo and The Walters Art Museum in Baltimore, also display large flanking columns. As a result, it was originally thought that the "Mona Lisa" in the Louvre had side columns and had been cut. However, as early as 1993, Zöllner observed that the painting surface had never been trimmed. This was confirmed through a series of tests conducted in 2004. In view of this, Vincent Delieuvin, curator of 16th-century Italian painting at the Louvre museum states that the sketch and these other copies must have been inspired by another version, while Frank Zöllner states that the sketch brings up the possibility that Leonardo executed another work on the subject of Mona Lisa.
Jean Delville
Whatever its interpretation, this very unusual portrait has had a strong effect on viewers. It can be seen as eerie and supernatural (Bade, Femme Fatale, 1979), or as "a positively magical vision" (Jullian, "Dreamers of Decadence", 1974). It is sometimes referred to as the Mona Lisa of the 1890s, and is also given the title La Mysteriosa . Today, few details are available about the sitter, and even her first name goes unmentioned in the literature. The most extensive information on her identity is given by Delville’s son Olivier in his biography of the painter. It is not a first-hand account, however, as Olivier was born at least ten years after the picture was executed. According to him, Stuart Merrill (a Symbolist poet who published his works in Paris and Brussels) had a house near to the Delvilles in Forest at that time. Olivier adds that "the young Mrs Merrill-Rion" was a Belgian, and that Delville was struck by her strange beauty and depicted her with a mediumistic character. It is likely that Delville painted other portraits of Mrs Stuart Merrill and the 1893 drawing 'Medusa', in the same media is undoubtedly one of these.