You did good. Buyer is happy with the work you exchanged for their money. Excellent! Couldn't think of a happier ending.
Once I ended up 'donating' my portrait services, for a single person portrait, to a silent auction at my step son's school. It was for a fund raiser for buying a van for the school to transport the kids to various activities. Somebody bid 50 bucks and won it. I spent something like 12 hours of my time visiting their house, instead doing a group portrait, which I really wasn't set up to do, four rolls of 120 film, processing chemistry, and 25 sheets of Ilford Warmtone 11x14 fiber paper, mat board, and frames, totaling multiple times what they paid for it.
Now that stunk! Badly. I could have just given the school the money instead. I wasn't even happy with the pictures.
You got properly paid for something by someone who knows how to appreciate your skill, ending up helping both them and yourself. Feel good about it. You deserve it!