I'm not a tatt person (not against them, just never could see anything permanent on my body) but this is beautiful. It appeared on my fb feed as something that fb in the past have taken down as...
Purely on a practical level, there have been some findings of melanomas forming within tattoos, not caused by the tattoos, but just developing where the ink is. Because of the tattoo, the change in colour of a freckle or mole is not noticed early on, with grave (pardon the dark pun) consequences.