photograph showed mysterious pair of boots behind little girl .
no one else was there , says the little girl 's father , who took the picture .
martin springall said their picture was not photoshopped .
he also said no one was standing behind the girl .
sceptics believe it could be a rocky outcrop or trick of the light .
` i really do n't like dwelling on stuff like this , to be honest - it freaks me out '
` i 'm about as skeptical as they come when it comes to the paranormal , so your guess is as good as mine '