Originally Posted by MP0WER
Customer in OP's case is viewing the photo as a good he purchased from OP. Not much different than a Porsche. Especially when you commission a car to be built from them. With the thousands of different build options to choose from, you could essentially make it a one off item built specifically for you. Not a perfect example but you see where i was coming from.
I guess it depends on whether this was a contract for services or for goods, i.e. did the owner hire him to take photos (perhpas a work for hire) or to buy certain of the photos he takes (like buying a Porsche)? Ultimately, it's a moot point since there's no written contract and OP is likely an independent contractor, but OP's original post isn't clear what the owner was hiring him for. Interesting academic exercise ...