On the Always On Display of the Samsung device, we can display our own picture, and the selected picture is then displayed in the upper part of the FaceWidgets.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Lock screen
Step 3:  Tap on  Always on Display
Step 4:  Tap on  Clock style
Step 5:  Choose  Picture -Type
Step 6:  Tap on  Add
Step 7:  Tap on  Just once
Step 8:  Choose  Image  you want
Step 9:  Confirm with  Done
  1. Open the Settings
  2. Tap on Lock screen
  3. Tap on Always on Display
  4. Tap on Clock style
  5. Choose Picture-Type
  6. Tap on Add
  7. Tap on Just once
  8. Choose Image you want
  9. Confirm with Done

Samsung Instructions