NOT MY PHOTO
I don't do car photography myself but here is what I think:
Your background should either be neutral or interesting.
>>3171354Here the background for example is neither neutral nor interesting. The sky is nice I guess but that orange light is distracting.
>>3139779This has a nice neutral background.
In the attached pic the background is a beautiful landscape.
I think you should not even try to take a good car photograph if you have no control over the lighting and composition. Like at car shows or if you see a cool car parked outside. Forget about it.