Model Concept!

A while ago I came up with a concept for my final project in Sculpting class. It was a maquette of some sort od alien woman.  Now I've decided to concept her a bit more, trying to make her appear more aquatic or amphibious.

Anyways, here's a portrait I did recently, I've shown it to a couple of my teachers and they suggested I make her even more alien in appearance.  I'm a bit torn because I want her to be pretty.  Luckily a friend of mine gave me the idea of making her a siren.... so she lures people in, then turns to a monster/ creature and eats them!