
One of Leonardo's painting trademarks was the use of sfumato, which is a style that eliminates the use of contour lines and creates outlines with the use of color only. It gives the art a 'smoky' effect, which can add drama and realism to the painting. One of his most famous examples is the portrait he painted known as Mona Lisa.
I have always been a fan of the sfumato technique, and often incorporate a version of it in my drawings. Below is an example of my "Renaissance" style, an art class project I did, in which I borrowed heavily from the master of both technique and subject matter. This Madonna and Child was drawn with charcoal pencil on charcoal paper, it was the preliminary drawing for a painting. I tried to use the 'smoky' technique in the folds of Our Lady's gown, the background, and the skin folds.
In this drawing of Playboy's very first Cyber Girl of the Year, Alicia Burley, I tried to use the shading to distinguish the various body parts from each other. Alicia has such lovely curves, and this art seemed to lend itself to using a variation of the sfumato technique.