Without seeing the picture it is impossible to say. You have to be careful in places that have mirrors. Light from your camera flash, sunlight, or incandescent lighting reflecting off reflective objects can appear in the mirror in your picture as orbs, vortices, even mist. I suggest not taking spirit photos into mirrors or near them, simply because their surface is so reflective. Without knowing what other surfaces were in the room at the time, it may be impossible to tell what it is.