La Scapigliata (Italian for 'The Lady with Dishevelled Hair')[n 1] is an unfinished painting generally attributed to the Italian High Renaissance artist Leonardo da Vinci, and dated c. 1506–1508. Painted in oil, umber, and white lead pigments on a small poplar wood panel, its attribution remains controversial, with several experts attributing the work to a pupil of Leonardo. The painting has been admired for its captivating beauty, mysterious demeanor, and mastery of sfumato.

There is no real consensus on the subject, date, history, or purpose of the painting. It shows an unidentified woman gazing downward while her hair fills the frame behind her. Many theories regarding the subject have been proposed: that it is a sketch for an uncompleted painting of Saint Anne; a study for the London version of the Virgin of the Rocks or Leonardo's lost painting of Leda and the Swan; or a painting left deliberately unfinished for its aesthetic value. 

source: wikipedia