I like the no-prostitutes one. Not to be an art geek, but--
I thought it was interesting that it used a formal red/slash symbol for "no" << formal/civil symbol coupled with what seemed like a cartoonish depiction of the prostitute. It leaves you wondering if it's a joke or not. Plus, if you're "working" on these, like adding/changing things, if you were to depict the prostitute in a clearly positive light, you could be mocking society, or it's take on prostitution.
/art geek off.
honestly, I think the other pieces are good, but it wouldn't stop me in my tracks. The prostitute one would make me think, at the very least.
Hope that helps