Screen saver on Apple watch

There is no screen saver on the Apple Watch. You can use a photo for a watch face, if you choose that face.

If you mean screen saver as in clock face, you can. Down below are steps for how to do it.

First, hard press on your apple watch. it should make the clock face shrink and a customize button appear at the bottom.

Second, scroll over completely to the right. There should be a plus icon that say new. Click on this.

Third, scroll down through the different watch faces until it says photos. Click on it.

Now you have a custom watch face with you photos.

Hope this helps!