Some bodyworks are real masterpieces of design. The designer of the BugattiT50, Jean Bugatti, was only 23 years old when he drew this model! He died at the age of 30 when he tried to avoid a cyclist in his car.
The Bugatti T50 is really what you would call a streamlined design because of the undulating line that runs all the way from front to back. If you want to draw this car, it makes sense that you start with that undulating line and the wheels. Then you build the rest on top of it and against it. Always draw very lightly in the beginning so that you can easily change. All in all, there are several ways to learn to draw realistic cars.
EXTRA: try to draw this Bugatti step by step