Rose can definitely be used as a full name.
I like it, although I prefer it as a middle name, even though that's a bit cliché and boring. It's a bit too popular fo me to use, but it's a very nice name.
It also makes me think of
Rose Tyler from Doctor Who and that makes me cry.
I don't like
Tobias and
Sebastian, to be honest, bu they do match with
Rose.