Now this is an interesting piece. The colors you chose as well as the pose and position of the model were very well done.
I like how the butterflies on her chest and neck appear to be painted on (are they?) and the ones on her face and hair are more three dimensional.
The only problem I have with this is the eyes and the expression. I don't know what anime/game/whatnot this is supposed to be a portrayal of so take my advice with a grain of salt.
The contacts you chose were so unnaturally bright that they actually cheapened the image. They simply look too fake.
Again, I don't know what character you were trying to portray so I could be wrong. Perhaps that is exactly the right color for that character. I don't know. But from a casual third person perspective I would have gone a bit more subtle.
And as for the face; you're very pretty. And you have a lot of promise as a model/cosplayer.
However, you need to work a bit on your facial expression. It seemed a bit generic and expressionless in my opinion. Remember, modeling is much like acting. You're portraying a certain character. So keep that in mind.