You don't know anything about the girl, but you want to:
1) Marry her - wow, marriage made in heaven
2) Propose to her - refer to 1
3) Ask her to go on date with you - fair enough
4) Ask her to be your girlfriend - based on looks? What if the girl only knows how to talk about painting her nails, and suntanning on the beach? I'd be bored to tears. No thanks.
5) Try to steal kiss from her - sure way to go to Changi Hotel
6) Secretly wish she was your sister - there's something very wrong with that picture given options 1 to 5 - I certainly hope it doesn't involve incest or stealing underwear from your "sister"'s drawer
7) Hoard her pictures and giggle at them in a dimly lit room alone - I suspect this one's the real life most popular answer, especially if you post it in P&P. :bsmilie: