Scottish Ghostie

Me and my friend where at Dalkeith in Scotland taking pictures where the murder of Jodie Jones took place. In one of the photos there is what looks like a big black creature made of black smoke, and it definitely wasn't there when the photo was taken. Another photo taken just seconds before had nothing in the background. It was really quite scary, but I read something about bad spirits coming up like that and good spirits coming up white. What do you think?