PhotoShop Question.

[camarorider]

I dont see why the picture above cant be used. If you want to find a better picture off the internet thats fine but it may have other issues. If you are after a particular color try and find someone that might have that car in a certain color. You will have a color closer to what you want so you can adjust it easier.
Black is one of the easiest colors to shift. White is one of the hardest, at least to make it look decent.
I wouldnt worry about the scratches or rust. Focus on the big areas such as color and wheels.