Of the conceptual car designs series, this stands out as my favorite by far.

Most of this series started out as an assignment in a design class, late in my academic career, to rough-shetch two automobiles.  As you can see, this sparked somewhat of a brief personal fad (although my friends may point out it was more of an obsession).  While I continue to enjoy drawing vehicles of various flavors, I have moved on from the 'quick-sketch' style here, if for no other reason than to avoid over saturation of the subject. 

Marker and Pastel Rendering - 1997