There seems to be 2 services needed here, a web designer/host with e-commerce, and someone to edit photos. For selling photos I highly recommend Sytist, which is a database that you purchase, can be hosted anywhere with your own domain name, is very customizable, has a built in shopping cart, and does not take a percentage of sales. Finding a photo editor is more of a personal preference, they will need to develop a relationship with someone to process the images the way they want.