Why does he like pictures of my hands?

He could have a Hand fetishism. I think around 1% of people have it so its not that uncommon. Might mean he will have a preference for things like handjobs but honestly you should just ask him.
Without seeing your hands, I have to assume your hands look really nice and he wants to see something he likes. At least he's not looking for pics of feet.
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Maby he is Jak from Titanic.
I didn't even know a hand fetish was a thing until I read the comments for this question.
why don't you ask him? how should we know about it ;)
either he has some hand fetish or wants to find a suitable ring for your fingers haha
Anyway just stay calm and ask him in a friendly way without judging him :)
As others said, hand fetish.
He has a hand fetish
Ask him why
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