Make sure Face ID is active on your iPhone. To change your wallpaper from the Lock Screen, Face ID needs a clear view of your eyes and their surroundings. Here's how to proceed:
1. Go to the Lock Screen and press and hold to view your wallpaper options.
2. Select "Add New" and then "Photo Shuffle."
3. Pick an album where your desired photos are located.
4. Decide how often you want the photos to change on the lock screen, so you'll see a new image each time you unlock your phone.
5. Opt for the "Depth Effect" to enhance the appearance of your wallpaper; it makes the subject of the photo appear above the clock.
6. Tap "Add" to finalize your settings.