Hi guys, I run a website with photos of exotic cars seen in Australia. I have been approached by a local businessman who wants to use some of my photos for advertising his exotic-car related business. He has asked me what I charge per photo, but I have no idea what to say. I will be selling the original digital file (not a print or anything) which he can give to his graphic designer to work with. So what would be a fair price per photo (I'm guessing he will take about 10 of them)? Thanks in advance.