How to Paint the Mona Lisa

This is my friend Anika as Mona Lisa, painted on an 8" by 10" canvas, a size I've been using for most of my portraits. I can't say I've copied the techniques used to paint Lisa as there is no sfumato smile or glazed subtlety like in Leonardo's original, but I have been using under-paintings more, which is something they did in the Renaissance. This is the third time I've copied Leonardo da Vinci works, the first being a Last Supper from a decade ago, and the second being a tiny Lady With an Ermine.