Huawei P9 Lite - Manual (Page 65)

Tips and Tricks
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Taking snapshots when the screen is off
You can take rapid snapshots with your phone, even when the screen is off.
When the screen is off, point your phone at a subject and press the volume down button
twice. Your phone will take a photo and display how fast it was captured.
Perfect selfie
Enable perfect selfie mode and customize the beauty settings to make sure you shine in
group photos.
In the camera application, go to Beauty mode, and then touch Perfect selfie. Turn on the
Perfect selfie switch, and then configure your custom beauty settings.
Next, switch to Beauty mode and touch to take a photo. Your phone will detect
your face and apply your custom beauty settings to make you stand out in a group shot.
Press the volume down button
twice in quick succession