Press the Digital Crown to open the app grid
Open the Settings app
Tap Clock
Tap Face Gallery
Browse watch faces and tap one to preview
Tap Add or Customize (if available)
Use the Digital Crown or side buttons to adjust settings if prompted
Press the Digital Crown to return to the watch face
To switch quickly: press and hold the current watch face
Swipe left or right to browse faces
Tap the face you want to use
Tap Done