Is It a Leonardo?

Indications of a da Vinci: 1. A similarity between the boy and child in his famous piece Madonna of the Rocks, 2. A distinctive 'v' shape in the middle of the woman's hairline reminiscent of that shown in the last supper, 3. The fleur-de-lys is often said to be a hidden emblem of the secretive Priory of Sion, 4. The area by the woman's shoulder is unfinished, common in da Vinci works, 5. A tracing of the figure in the Last Supper matches exactly the outline of the woman in this painting, 6. The baby's second toe is longer than the big toe - another classic da Vinci feature (click photo for larger image)Yet another master painting, possibly a lost Leonardo da Vinci, has been discovered, this time hanging on a farmhouse wall in Scotland, "gathering dust"; it could be worth £100m.

Needless to say, the painting will need to undergo a variety of tests to confirm its age, materials, and so forth. The caption below the image, however, will give you an idea of the kinds of conventions art historians look at that go beyond the strictly formal properties of a painting.