Draw the wheels before the rest of the car. It might sit better then. Zulehan is right too, pay attention to today's Buicks and concepts, and get a better understanding of the Buick "design language". Todays best selling car companys and really the only ones that sell, use "design language". Some cues you are using look 15-20 years old.
But your car drawing skills are getting better. Keep it up and you'll get there. All it takes is practice, patience and persistance.