Leonardo da Vinci's self-portrait in red chalk is one of his most famous drawings. The sketch is partially covered by written notes, which can be used to compare the two.
One of the most famous drawings by Leonardo da Vinci is a self-portrait in red chalk, where he looks quite old. In fact, there is a sketch in one of his notebooks, partially covered by written notes, that can be a self-portrait of the artist when he was young. The use of image processing, to remove the handwritten text and improve the image, allows a comparison of the two portraits.