Too many perfect smiles. No way you get everyone looking at the camera and smiling flawlessly like that. I'd go with a composite. Some of the people look a little odd, too. Look at Megan Fox standing next to Jamie Lee Curtis on the far right. Doesn't Megan look off scale-wise? She's probably shorter than Jamie Lee, but she looks like she's almost further away, like the scale is not proportionate. I think there are several people like that.