Great offering, pretty lousy site.
For anyone who want to have a profitable business, some usability reading is essential - "Designing Web Usability" from Jacob Nielssen is a good one. Most of the feedback you got are covered in the book.
The details shouldn`t be on the home page. Instead, it should simple say "transfer your photos to tiles", with a "See how" link, which gives the details.
You need to have an account system, where people can upload images (drop the email, it is so unreliable these days and very unprofessional), pay, and see status of their order. Basically, you need a real e-commerce system.
And how much does it cost? I had to dig to find out....and I still don`t know how anyone would pay.
However, you have a killer business there. I love your offering. Congrats!