 One long-standing mystery of the painting is why "Mona Lisa" features very faint eyebrows and apparently does not have any eyelashes.In October 2007, Pascal Cotte, a French engineer and inventor, says he discovered with a high-definition camera that Leonardo da Vinci originally did paint eyebrows and eyelashes.Creating an ultra-high resolution close-up that magnified "Mona Lisa"s face 24 times, Cotte says he found a single brushstroke of a single hair above the left eye.