One great new feature in the BlackBerry Z10 is the Time Shift mode.
Time Shift mode allows you to take a time-lapsed sequence of photos and select the best. You can also use the face recognition software to pick and choose certain elements from the sequence to build the perfect photo. To use the Time Shift mode from your home screen, touch the camera app, and touch the camera icon to switch your camera to Time Shift mode. Touch the screen to take the series of pictures and then touch and drag the slider to view the sequences. Touch the check mark button to select the desired image.
If you want to replace the expression on a picture of a person, touch the face. Turn the dial to browse through facial expressions from other pictures in the sequence. Touch the face that you want to use, and touch the check button to replace the expression.