It could either come across as super creepy or super slick.
Depends on how you approach it.
I would do it after you fvcked her good. Then be kinda ****y and funny and tell her to pose sexily for you with a big smile on your face as you hold up your phone camera. Take a couple snaps and you're good.
But if you just blatantly ask her "oh can I take some pictures of you" that might come across as kind of weird
Its all about how you approach the situation.