Just had my LDV van done with pictures on it. My graphics man told me any picture sent by email or from a web site isn't good enough quality (Pixels I believe) to blow up big enough to go on van, as the email programe reduces any good ones you send.
I had to get the manufacturer/agent to send me a pic of machine on a cd, and I had to set my digi camera to best quality photo's. He blew the first attemt normal quality ones up to the size needed and they looked like they were made of oblongs