hmm
the pictures that you have that clearly show a figure (i.e. the pictures where there is, without a doubt, a person in the picture, not something disputable) seem very fake. in your description you say that the pictures were originally taken and no figure was in the real place and only appeared when the picture was developed... however in the cases of the obvious figures i doubt anyone would actually take pictures of those venues in those angles and NOT be framing somebody (like why would anyone take a picture of an empty room with nothing in it and stuff). the picture seems to focus too much on the ghost for it to not have been planned.