Harpy

The Harpy is a demonic woman, hideously ugly. Her looks are counterbalanced by her voice, which is beautiful and alluring, capturing the wills of any who listen to it and drawing them to their deaths.

I almost went for something more bird-like, but I stopped when I realized my ideas were too close to the World of Warcraft harpies. The head of this one is still based on that of one of the ugliest birds in the world, the turkey.