Hi There,
My understanding is that certain Photo Pass people can take these pictures. It's based partly I think on where in the park you are but not totally sure of that. They pose you special like your whole group putting your hands together palm up and looking down that way suprised. When you get the picture back you'll have like Tinkerbelle or Stitch in your hands.
Best thing to do is just ask the Photo Pass person if they can do a special pose like that. Best of Luck!