Personally I'd:
- try to stick to the factory images but I do not know if there could be some copyright issue
- have all pics with the same angle and same size (even when opened, so resizing them all upfront)
- no more than two pics for each serie. 3/4 front and 3/4 rear
- pics with specs as stock as possible (e.g. wheels)
If then you want to be covered of a violet aeross, those are not missing.
