I would not think it was creepy particularly but I would feel like I didn't necessarily have much to say so I'd think of a couple good lines other than just, "Hi, it's Perna from your X class" I'd think about what I liked about her class in particular or comments on my papers/grade, whatever and the subject in particular and what I plan to do "with" it in the future, how I see it as fitting into my life (even with it not your major) and if you are moving from that town I'd tell her where to and ask if she knew any good art museums near to visit and why, just get an "art" thing or two in there, keep it on a subject you know the two of you have in common so an awkward silence doesn't happen?