Im no website designer by any means.
But I have a few things, if it were my website, I would change.
I would get rid of the black and white theme. Looks kind of generic. Or maybe make that cars rear end in color on the front page. That would look cool.
Also, tbh, all of your pictures dont show off your work very well. They aren't quality photographs. Like your headlight restoration for example is dominated by the hood/front bumper of the car. Take some close up straight on shots so we can really see the difference.
Also, that picture of the Mazda needs to go. It is too blurry and washed out to really see whats special about. I dont like the trash can being in the picture either. Fine for a forum shot, but not a professional website. Also, try to take your interiors shots without your shadow or random objects(cell charger) being in the picture.
Not trying to overly critical. But I think you are off to a great start. Good luck!