The use is what will determine the price, which is why asking specific questions will help you determine the right fee. Keep in mind that the calculators often quote fees that are quite a bit higher than what you'll be seeing in the real world of licensing images. They are a starting point to give you some guidance. Yes, the uniqueness of the image will bump up the fee, if it's a shot the buyers can't locate elsewhere. For instance, last week I licensed an image of an Abyssinian cat eating food from a glass bowl...they needed that specific shot, not just another portrait and so I was able to obtain a larger fee as the image was somewhat hard for the client to locate.