The situation is this. I responded to an ad for a college hookup on CL. The girl eventually asked for my photo and liked it(yum).I left our last interaction hoping to increase sexual tension with "In five words tell what will you *************"

I want to f-close, but as a virgin I'm inexperienced.
I don't want to be desperate but if I drag my feet she'll lose interest and I'll lose my chance.

What should I say to get her to come to my dorm room and should I ask for her photo?