They think it counts as personal growth much in the same sense as shit tier anime/YA writers think giving their characters a new outfit and haircut counts as character development.
The warpaint does artificially suggest them something incredibly hard to find for zoomers and mentally people who do a lot of emotional eating: an identity.
To be like their favorite celebrities and because of "muh individuality". For women, in particular, it serves as a signal for promiscuity - to put it politely.
The process of getting a tattoo causes an adrenaline and endorphin rush because skin is being damaged. This can act as a really fucked up form of escapism for some people. They'd get the same rush from exercise, but lol fat.