Replace a person's expression using Time Shift mode
1. In the Camera app, tap > .
2. To take a picture, tap . Hold the camera steady until the picture appears.
3. Drag the slider at the bottom of the screen back and forth until you find the best picture.
4. Tap a recognized face.
5. Use the dial to browse the available expressions.
6. Tap anywhere on the screen.
7. Tap .