Open the Watch app on your iPhone
Tap Face Gallery
Choose a watch face
Tap Add
Open the Watch app on your iPhone
Tap My Watch
Tap the watch face you want to edit
Tap Customize
Select the photo or wallpaper option if available
Choose a photo from your library
Adjust the photo if needed
Tap Set as Current Watch Face
On Apple Watch, press and hold the current watch face
Swipe to a different face or tap the plus button
Select a photo-based face
Add the face
Press and hold the watch face again
Tap Edit
Change the photo or background settings if supported
Use the Photos app on Apple Watch to set a favorite photo as the face background
Sync photos to your Apple Watch from the Watch app on iPhone
Select the synced photo on Apple Watch
Tap the share or options button if available
Choose Create Watch Face if shown