Nice thread guys! Go on, go on.
Personally, I always thought there's something disturbing about photography and cinema, in the way it can catch a person and preserve his or her look and voice for many years, freezing time, never getting older, never changing, so people can see and hear a person even when he or she is dead. So unlike in our world where nothing is permanent. It's both beautiful and terrifying.
As for vampires not having a reflection, I thought it has to do with them being nosferatu, like a ghost, and ghosts (tend to) have no reflection.