I think the problem seems to be, especially from the rear of the car and around the tail lights is it looks like the car has a series of dents. Looks like a result of the mesh moving in in then back out, although this may match what the blueprints show sometimes the blueprints can be hard to read and may be misleading about the shape.

As a rule most cars have long smooth edges that generally bend to one direction or another eventually but rarely bend in and out in small sections because they want to avoid a "dented" look.