Nice to see a challenge here!
Your beetle here is nice and similar to the real model, maybe the best minifig model of the car.
I would maybe change the middle section of it, it looks too long, especially looking at the second picture, also I would enhance the roof's roundness.
If I had to choose from yours and Dennimator, I would choose yours for being realistic.
But I would also chose his for the winner regarding nice ideas.