This is Leonardo da Vinci's "The Head of the Virgin in Three-Quarter View Facing Right" and can be seen at the Met. The medium is black chalk, charcoal, and red chalk. It was completed from about 1508 to 1512. The reason I chose this portrait was because I have never seen this work by da Vinci before. I rather look at his works done in charcoal and chalk rather than paintings. He really enforces the use of light, which came very good and detailed.