Watteau: a drawing Master

I found this drawing on the official website for the Louvre. It is by Antoine Watteau, a French painter born in the late 17th century. Nowhere in the Wikipedia entry for the artist, could I find any references to his drawings. He is a Master at drawing. The three-dimensionality of the subjects rendered in this two-dimensional drawing is astonishing. It appears that only three colours of charcoal or conté are used: black, sienna, and white. Perhaps an expert can tell us more.

I love this drawing (click on the image to enlarge it for more detail).