Hi Samsonite, did you shoot in Raw or just Jpeg?
Your pictures are really quite dark. it doesn't look like the sunny day that we know it was for the shoot.
There's vignetting problems on most of the photos, unless you did it in post processing for an effect?
If so, it's not an effect suited to the photos in my opinion.
The shutter speed has frozen the cars and background, even the wheels are static, giving no feeling of speed.
I really didn't want to post this but it's meant as constructive to improve your photos.
You should be able to improve the photos especially if you have the Raw files.
Of course others may disagree, just giving my opinion.