I'm having trouble getting my four year old to smile for photos where she isn't grimacing or making a really weird face. If we stand in front of a mirror, she can adjust her smile so that it's attractive, but if she doesn't have a mirror, she just contorts her face into these really odd expressions that look awful. How can I help her learn to make a nice smile? I've even tried saying don't smile at all, but she feels compelled to make a face if she knows I'm taking a picture.