PARIS, France (CNN)-- Drawings on the back of a Leonardo da Vinci painting may have been sketched ... back of it -- a horse's head and a partial skull. Closer scrutiny also revealed another ...

I have come to Windsor Castle to see the queen’s collection of Leonardo da Vinci drawings ... the umbra and penumbra of shadow; a skull, a heart, a foot, and the sweep of the human face ...

Everything you need to know about Leonardo da Vinci is contained in the work he did in the 1480s and 1490s for Ludovico Sforza — Ludovico il Moro, the Duke of Milan. And it’s in this capacity ...