my brothers"girlfriend" takes photos of me?!!?

[Ellie]

my brothers girlfriend(sort of) has been taking photos of me. I don't know her very well but I got the impression she was nice the few times she spoke to me. ive come home today and my brother showed me some photos she took of me and my friends while we were at school. my brother has said she's only sent them to him so it's ok but im worried she's gonna put them on Facebook or whatever? I don't think that its acceptable for her to be able to do something like that so what shall I do. they are older than me.