Sign in to web.airdroid.com, find the Camera icon and click it.
You can switch the camera (rear camera and front camera), take a shot (saved either to computer or Android), turn on the flashlight and rotate the image.
This feature is only for Premium Users and Bonus Users under Remote Connection Mode.
Related Help Articles:
[Help & FAQ] How to Purchase AirDroid Premium?
[Help & FAQ] What Is Bonus? How to Get Bonus?