1. From your watch face, swipe left or right from edge to edge.
2. Stop when you get to the watch face that you want to use.

Learn about all the Apple Watch faces and their features.

Not all watch faces are available in all countries or regions. Hermes and Nike watch faces are available only on those models.

1. Press the Digital Crown to go to the watch face.
2. Touch and hold the display.
3. Swipe left or right to choose a watch face, then tap Edit.
4. Swipe left or right to select a feature, then turn the Digital Crown to change it. For example, you might change the color of the second hand or the markings on the watch face.

Read More: https://support.apple.com/en-us/HT205536