What did Ellen capture behind her? Is it a phantom? An anomaly? You decide:
"I thought I would share this ghost picture - it's me and my dog. And then, if you look behind us, there is what looks to be a purple skull. There was nothing behind the dresser...there is not any room."
- Ellen Morrisette
Click on the thumbnails for a larger image and more information
Conclusion:
We could not come up with an explanation for the head that appeared behind her. We thought maybe it could be a piece of particulate, but the problem with that theory is that the face is behind (cut off by) the dresser. This means that whatever this thing is, it was definitely behind Ellen in the photograph.
Is it a ghost? You decide...