I love the color of the car, but the taillights don't look like they flow with the car at all. The ends of the taillights don't coincide with either the bumper or the rear quarter panels. A bit of smoothing out and it'll be good.

As for Kristen, I think she's very attractive. For the gaining weight part, a few pounds wouldn't hurt and it sounds like she's trying. Either way, her metabolism will slow down soon enough and it'll start to add on.

Best of luck to both the owner of the car and the model.