I have a customer who commissioned me to make two custom Disney princess tiaras. I explained my process to him, how I don't solder metal and such, even sent him several pictures of my progress to make sure he liked what he saw. He paid for both before the second one was finished. I sent him a picture of the second one finished today and now he doesn't want that one. I've told him that is fine but I will only refund $20.00 of the price (materials) of that tiara since it was a custom order and took several hours to complete.
Does that sound fair or should I refund him more/less?