Okay, what I think is happening is this.
If you look at the hair between her ears on your front and back views, it stands up quite a bit, a sort of quiff rising above her ears. In your side views, however, the shape of the hair is different, much flatter. It is the transition between those 2 different hairstyles which is showing up as she turns. Also the height of the ears is not quite consistent, so when she turns from side to back, you can see the difference there.