Yeah I'd get some reference off the web and have another look. It does look kind of flat here and there. Are you using a layered shader? As I think it would benefit from it as cars have two gloss coats, paint and laquer this why you get that cool looking reflection on cars like this.

Also check the model around those headlights they look a bit low res right now. Overall its a great job but I think observation is the key now on this one. Keep up the good work and give us an update soon

_J