In your 1st answer of this post, except the 3 first pics all the rest are with black borders. Please edit that answer and cut them.
Besides that you can enlarge the pics what you want (some of them 1440X900) but only will be uploaded with 720X498 at the maximum and if they are with DVD quality. So if a vehicle is far and little it will be always little and if it is "generic" always will be "generic" despite you submit an enlarged pic.