[knightvision]

Your speed of improvement is breathtaking... ;-)
I like the shading on the windows and the headlights. To improve your drawings, I'd concentrate on proportions. And the wheels. Damn, stupid wheels. Well I shouldn't give advice for wheels,'cause mine look terrible sometimes.
Isn't it strange that the both of us, coming from Germany, are drawing so many US cars? I just started a Viper...