What is a portrait on overwatch?

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Tags

1. #heroes
2. #players
3. #change
4. #character
5. #levels
6. #overwatch
7. #playing
8. #which
9. #portrait
10. #matches
11. #rewards
12. #played
13. #those
14. #experience
15. #portraits
16. #borders
17. #player
18. #regardless
19. #level