PHOTOSHOP Work!!!

So for the line of business that I work in we do Vehicle graphic and
wrapping. When a customer comes in and asks to have there car wrapped or
a graphic kit fitted then we want to be able to make them a visual edit
of their vehicle with the colour/graphic kit applied. But we are also
looking for it to be as realistic as possible.

I have attached a photo of a graphic designer who does exactly this but
he uses photoshop!

So I'm trying to find out if you know how to make what he makes on
photoshop in photopaint and as realistic as he does.

Thanks Kieron!