Cruz, most "pro" photographers in our market charge a minimum of $100 an hour for on location stuff, with photo prices and retouching on top of that (with handsome profits built in to those as well). I'm not exactly sure what the situation is, but I'd say anything under $100 an hour is going to be cheaper than any "pro" I've ever seen around here. Or you could charge by the photo, but if I understand that you're giving them electronic files, that's a little more difficult to do. Physical photos are easy to charge by size, but with files it's often hard to get people to see the value in a file.