Psychics are able to read a person's energy from any object. As far as I know, a photo is the best option for this. Therefore, you can safely take a photo with you. In order to prepare for the seance I recommend you to read this information psychometry definition, so as to know what you should ask a psychic to do and what you should not.

Hi. Yes, it is quite normal practice if the specialist you go to knows how to work with such things