There's an Yves Saint-Laurent exhibit at my local modern art museum with his various sketches of prototypes throughout his life. Your style is very similar to some matador sketches he did. Capturing the form in quick, bold lines. I really like it.
That shadow made me think of the artist that does similar drawings as this, but they leave a single element as the shadow and draw around it. Pretty neat exercise if you are practicing and want to add something to it.