Creating Watch Faces from Photos
It’s perhaps a lesser-known feature of the Apple Watch, but if you’ve synced photos to your wearable, you can turn any one of them into a watch face directly from the watchOS Photos app.
This was previously accomplished using a Force Touch gesture, but now it’s even more obvious, with a small watch icon appearing in the bottom-left corner of the screen by your photo. Tapping on that will prompt you to create either a Kaleidoscope watch face or just a normal Photos face, after which you’ll be taken straight to your new watch face.