She did not like herself. But she did like art. So she tattooed her flaws and turned them into art-pieces.
That Jikook moment was NOT fanservice by ANY means. Whoever said it was fanservice is blind, in denial, or been an ARMY for two days. Like that was too natural + Jin's reaction + Jimin and JK didn't even acknowlede Army's screams + both of them like literally walked away after, pretended it didn't happen and went on business like usual. That moment was unplanned. (p.s. Jimin legit looked like he stopped himself from actually kissing JK when he realized where he was)