I'm an art major, and lately I've been drawing nude models in class. The model for the past two weeks has been this gorgeous Filipino girl.

The first day we started drawing her I noticed that she kept giving me sideways glances. Later, when she was fully clothed, I decided to try and make eye contact with her, and when she returned my gaze she immediately smiled at me.

Ever since then, we have exchanged a lot of looks and smiles from across the room, and I've occasionally gone up and spoken a few words to her - I've asked her about modeling - but nothing more than several short sentences.

I really want to go up and talk to her more, but here's why I'm finding it difficult:

The main problem is that she doesn't come in until class starts, and as soon as it starts we have to start drawing her. When class ends, she usually dresses pretty quickly and leaves, while I'm still scrambling to wrap up all of my art supplies. The only times I've found enough time to say a word to this girl are during the short 5-10 minute breaks in the middle of our 3-hour classes.

Another problem is that I have no idea what to say to her! I feel awkward enough going up and talking to her after JUST seeing her completely naked. What can I possibly say to start a conversation?

TL;DR: How would you start a conversation with a girl you've been drawing naked for the past two weeks, and what would you say?

Edit: Thanks for all the comments! It seems like most of you think I should just treat her normally, as if I've never even seen her without clothes on, and possibly use the artistic element of the situation to my advantage. I was originally going to tell her, "I've already seen you naked so we might as well just have sex now" but your advice seems a lot more sound.