Heck is not that bad. In which anime u saw the m6? Im curious...
And about that car, it aint bad, but there are several things to improve.
Front: is distorted it looks like u crashed it like if it was a test dummy
Side: There is no shadow behind the front wheel, side skirt has no volume. There are 2 mirrors and there I just see 1. (Because it has 4 doors )
Back: Spoiler edge needs to be straightened up.