in addition to name, phone number and other fields, contacts can also have their own photo. instead of the initial of the name, the assigned photo/image is then displayed. by default, contact pictures are already available on the Samsung device, some of which are animated. in addition, you can also select your own photos from the gallery.

Android 10 (One UI 2.0)
Step 1:  Open the  Contacts -App
Step 2:  Tap on desired  Contact
Step 3:  Tap on  Photo
Step 4:  Choose a default  photo  or tap on  Gallery
Step 5:  Tap on desired  photo
Step 6:  Tap on  Done
Step 7:  Confirm with  Save
  1. Open the Contacts-App
  2. Tap on desired Contact
  3. Tap on Photo
  4. Choose a default photo or tap on Gallery
  5. Tap on desired photo
  6. Tap on Done
  7. Confirm with Save

Samsung Instructions