The seats need to look like they're behind glass, so add a layer above them of white with low opacity.
The wheels are way too large to be functional, make them a tid smaller.
When you lowered it, you forgot to extend the rear wheelwell down, so it still looks like you have a trunk, just add a little black under the existing one, making sure not to go over the body.
The vents on the side need to be adjusted a little to conform with the body, the rear needs a little more blur around the edges and the front one needs a better color match.