Look at Photos on Your Apple Watch
You can sync photos from your iPhone to your Apple Watch so that you can always see your favorite photos. Choose albums to sync to your Apple Watch and then they will transfer over from your iPhone.
You can sync up to 500 photos from your iPhone so that you have them on your wrist to look at, share or set as a custom Apple Watch face.
With recent Apple Watch updates, you can create an Apple Watch face that shows you a new photo from your favorite photos every time you look at the Apple Watch.