How to use camera
How to take pictures from camera on watch
Question marked as
You don't take pictures with your watch directly. The watch doesn't have a camera and isn't able to take pictures.
What the watch can do is control the Camera app on your phone - that is, you can open the Camera app on your iPhone and set it up to look at your subject, then you can use the watch as a remote trigger to actually take the photo, but it's the phone that takes the actual picture, not your watch.