Unfortunately, it is not currently possible to set a custom lock screen picture on an Apple Watch. The lock screen image on an Apple Watch is automatically generated based on the watch face you have chosen. However, you can customize the watch face with a picture of your choice, which is displayed when you raise your wrist or tap on the screen.
To add a picture to your Apple Watch, you can use the Photos watch face. Here are the steps to add it:
1. Open the Watch app on your iPhone.
2. Tap on the “Face Gallery” tab at the bottom of the screen.
3. Scroll down or swipe left until you find the “Photos” watch face.
4. Tap on the “Photos” watch face.
5. You can see a preview of the watch face and options to customize it.
6. Tap on the “Add” button to add the watch face to your Apple Watch.
Once you have added the Photos watch face, you can further customize it by selecting the specific photo album you want to display on your watch. You can choose from your Favorites, Recently Added, or any other custom album you have created.
To change the photo album displayed on the Photos watch face, follow these steps:
1. Open the Watch app on your iPhone.
2. Go to the “Face Gallery” tab.
3. Scroll down or swipe left to find the “Photos” watch face.
4. Tap on the “Photos” watch face.
5. Tap on the “Customize” button.
6. Swipe left or right to select the album you want to display.
7. Once you have chosen the desired album, tap on the “Set” button to save the changes.
Now, when you raise your wrist or tap on the screen, your Apple Watch will display a photo from the selected album on the Photos watch face.
While it may not be possible to set a custom lock screen picture on an Apple Watch, the ability to customize the watch face with your favorite photos allows you to personalize your device and have a unique look whenever you check the time or use your watch.
I hope this helps! Let me know if you have any more questions.