Tree Stump Mist Ghost Picture

Lizzie D. sent this picture into Angels & Ghosts. It looks like a mist around a tree stump, but some swear they see a ghost face in it when looked at from the same angle. Is it a ghost? You decide...

"The ghost my mom said looked like her great, great, great Grandma - she showed me a picture taken when she was 30. She died several months later, giving birth to her first child."