I have the same feeling about the pictures I add, but on the other hand when I can put better pictures I'd like to do it.
When the one that put the pictures is known I usually do not replace these pictures, except those that are really better.
A "better" picture would be for me a bigger and/or sharpen picture. Or where the vehicle is more visible.
If it is the choice of the view of the car that could be better in my opinion, I add extra picture in the thumbnails with other views.