Gotten from Abundance army sergeant, during the side quest The Lucky Charm, only if his dog hasn't attacked him yet. The sergeant wants a picture of a girl, all of her, and preferably without too much clothes on.
Head back to Jey and tell him what the sergeant wants. He’ll tell you about a person who has a whole bunch of pictures, namely Fatso. Fatso can be found with his gang in the closed off area after the Camp: Crater Zone entrance. Be careful though - talking to him will start a fight with Fatso and four of his ‘brothers’, a challenging fight no matter the difficulty level. If you win, the picture is yours. Return to the army sergeant to get the Lucky Charm and complete Another Face.