Integrating buyer supplied customization into an order

I use an order form to sell one product, a house-selling method. IFS does not have a way to allow the buyer to send me the picture of their house during the purchase process. So, I send an email immediately to the buyer after the purchase with instructions on how to submit their picture. So, the questions:

  1. What is the best way to gather my customer’s pictures, with the following in mind:
    I MUST combine my order information (Name, address, etc) with the buyer submitted picture, in an automated way, and be certain that I add Jim’s picture with Jim’s order information.
  2. I can have the buyer enter order number and the picture, so the picture is identified as belonging to Jim, but how do I combine the two separate bodies of data into one?