Mona Lisa
The painting is thought to be a portrait of Lisa Gherardini, the wife of Francesco del Giocondo, and is in oil on a white Lombardy poplar panel. It had been believed to have been painted between 1503 and 1506; however, Leonardo may have continued working on it as late as 1517. Recent academic work suggests that it would not have been started before 1513. 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.
Portrait of Dorothea Berck
Portrait of Dorothea Berck is a 1644 painting by Frans Hals that is in the collection of the Baltimore Museum of Art. It depicts Dorothea Berck at age 51, the wife of the prosperous Haarlem merchant Joseph Coymans, whose portrait Hals also painted. Both paintings were executed on the occasion of their daughter Isabella's wedding, whose marriage pendants Hals also painted.
The painting, like many of Hals's portraits, is inscribed and signed, but there is no mention of the identity of the sitter, and it was only identified as Berck in 1908. 
The portrait is noted for its classical similarity to the Mona Lisa. Like the Mona Lisa, she sits upright in a dark chair and rests her hands on either a dark desk or perhaps a large dress that surrounds her. Her ungloved hand may be clasping a book or part of her sleeve. The loose brushwork is typical of Hals and shows a fleeting gesture with the casual way her finger is hooked over her wrist. Portraits of subjects with one glove on and one glove off are common in Dutch 17th-century marriage pendant portraits. Gloves symbolize the wedding vows where the husband and wife each hold one of a pair of gloves. In this case, her husband Joseph Coymans is wearing the "other glove" in his pendant portrait. In Hals' marriage pendant portraits, the husband is always situated on the left and the woman on the right, and the light always comes from the left, shining fully on the woman.