My [20M] girlfriend [18F] wants to know what kind of nude she should post

We've been together for over a year. I love her a lot and I'm usually the jealous type of boyfriend. It's not an issue most of the time, because she's quite modest in general. Lately she's been wanting us to be a bit adventurous though and she wants me to loosen up a bit and let go of my jealousy.

She suggested to try posting something risqué on the internet anonymously. I've debated on it for a while and finally gave in. We agreed that it would be one photo only for now and 100% anonymous. The picture can feature only one major body part.

Now she wants to know what kind of photo would be most appreciated: 1. Tits 2. Ass 3. Pussy closeup

You can vote here: https://www.strawpoll.me/21179314

That's her: https://i.imgur.com/ypOXYwm.jpg

/r/Nudes Thread Link - i.imgur.com