|Photo by User:MatthiasKabel from Wikipedia|
It shows that the top represents a curly hair-do, and that IT HAS A FACE (or the assigned place for it). This means that the statue is not a simple faceless representation of the "fertility" - it is a WOMAN.
Most of the time you will find photos of the same statue that show only the "beehive bun". The photo would probably go along with the caption that describes it as being "faceless" in the intentional or unintentional effort to diminish the status women had in prehistoric times.