Graveyard Ghost Photo

Monica sent this ghost picture of some misty figures around a tree. The one figure looks well defined with a clear head shape. Take a you see the figures?

"My husband, daughter and I went for a walk in a graveyard a couple of months ago and my daughter took this photo. They were doing renovations in the graveyard at the time. On the left hand side there is a tree, and it appears to me that there are three ghostly figures surrounding the tree trunk that look like young boys. I'd appreciate an analysis, especially since my husband thinks there's nothing to it and there must have been something behind the tree. This picture was taken in Vancouver, B.C., Canada."