Mona Lisa has no clearly visible eyebrows or eyelashes, although Vasari describes the eyebrows in detail. In 2007, French engineer Pascal Cotte announced that his ultra-high resolution scans of the painting provide evidence that Mona Lisa was originally painted with eyelashes and eyebrows, but that these had gradually disappeared over time, perhaps as a result of overcleaning. Cotte discovered that the painting had been reworked several times, with changes made to the size of the face and the direction of gaze. He also found that in one layer the subject was depicted wearing numerous hairpins and a headdress adorned with pearls which was later scrubbed out and overpainted