Comment Everyone needs to stop playing lawyer (Score 1) 458
Lots of people on here are giving answers that to a techie makes perfect sense, but in the real world do not.
Assuming you live in the US, are you in a Community Property state? In that case you might both own all of it. If not then other things come into play, but "who took the picture" and "who owns the copyright" and "in whose name is the domain registered" are stupid questions on their own.
You need to consult a matrimonial lawyer and not get advise from people who are giving "common sense" answers which are likely neither.