In the beginning it was a bird's skull on paper (it supposed to be just a bird's skull), but then I changed my mind, and I added the girl's face, and suddenly the picture looked like a woman wearing the bird skull mask, similar to masks from Venice...
Now I have to finished editing it in photoshop.
Images from top: http://tombanwell.blogspot.co.uk/2010/05/plague-doctor-mask.html
The Venice mask
The Woman with Bird's skull.