Quick White Board Pen Sketches

Staying over at work after I finished my hours to sketch some cars before going home. Often speed is the key to success when searching for shapes and I think I found some interesting lines to build on in these quick sketches. After wrestling with the proportions of the lower sketch for a while I scanned the sketch and kept on experimenting with the proportions in Photoshop. After some time I think I found some more balanced proportions. Hopefully I will find time to keep developing these sketches into finished renderings. My guess is that the quickest sketch will result in the best design, but I think it's hard to know for sure until I see the finished renderings in front of me.