ill advise against food pictures! in any setting, at any times!
other than that, i also think you wont stand a chance, since she already told you so...
for wanderers idea about staying friends and that it maybe leads to something (with the implied tiny possibility), unless youre already friends with her, someone who you hang out with regularly, i dont think anything will happen... people decide and dont change their mind too easy about it...
also keep in mind that quite a few dont date students...