Good Job! it's hard enough drawing a car that already exists but a whole other level to design your own.
Not to beat a dead horse but I have to echo what Brian and Ben said. Get some vellum and do an overlay of your favorite parts of the original piece and refine them with pen, one or two pieces at a time.
You're off to a good start and this is exactly how good designs evolve. Get the idea down loosely and then tighten it up and refine it with the overlay.
For exercises, try some 3/4 views of that car and check out Thom Taylor's book; How to Draw Cars Like a Pro and How to Design Cars Like a Pro by Tony Lewin. Both books have lots of great designs as well as great advice that will help you refine this design and add some more to your portolio.
Good Luck!
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