The higher resoluton the better, and preferably as square on as you can manage. At least 300DPI if you can. Just some closeups of the guy and some good sized side-on shots of the side.
If you want somewhere to FTP the photo's to, let me know. Or upload them to localarcade in the work to be done section.
Drop me a note anyways and once I've vectorised it, I'll upload it to localarcade.