Imagining a coin properly is not easy. When I started to photograph my coins, I literally took hundreds of useless pictures. In fact, I haven't done it in so long I probably forgot how!
If you are thinking about using a scanner, well it works........but the coins always look flat and bland. You don't get any luster, hardly any color on toned coins, and the images just are boring. Heck, some cell phones take darn good photos now! I bet a cheap-o $200 camera could do a great job.