Have you thought about turbofan wheels in the front(sorry, I love turbofans haha)? I think that would go well with the look of the car. Also, perhaps cover the whole wheel in the back and maybe lighten the whole image so the details can be seen(unless you plan on changing the color). The car/background combo is good, don't change that. Don't go too crazy on the aero and keep it up, this one should end up looking cool