Speaking for myself alone, i don't see having forty-something photos is valid, not when the subject is "custom car"; especially not when as its name implies would be "custom" and logically inferred to be "of one's liking". We get it, different paint on different cars. So really now, it's your word against my word and frankly, Wikipedia is not your car aficionado magazine photo-collection. In my opinion having eight photos showing different kinds of modifications is far more than enough, if you want to scrutinize photos of cars, go to google image/car show/book store where it's meant for.
Handful of bland pictures? Oh so you and i now both have a point of agreement.
As for glossary, WP:NEO. 
I don't have sources handy Then it's inadmissible. QED