I have a photo question I am hoping someone can help me with. A friend of mine wants to use some of my images for her business (yoga studio). She wants to use them on her website in web banners as well as on promotional and advertising materials. She also wants to incorporate some/one of my images as part of a brand for her studio. I will retain copyright for my images, but she will be able to use them in the ways mentioned above. How do we figure out a fair price for this? I don't know where to begin. Thanks!