Angel Picture, Ghost Picture, or Fake?

This angel or ghost picture commonly seen on the web was taken after an auto accident. The passengers in the car survived, which lead some to believe an angel assisted them. Is it a fake or real photo of a ghost or an angel entity?

More to the Story: Lucky to be Alive

The photo actually was taken with a film camera, and the entity does appear in the negative. Several photos were taken in succession, but this is the only image that had the angel or ghost. No one was killed in the accident, and the photographer strongly believes the entity is not a ghost but her guardian angel!

Notice how the ghostly mist takes on the shape of a human form. We do not have a "normal" explanation for how this angel shape could have appeared in the photograph.