Traditionally Tattooists like hairdressers are tipped at 15-20%. Tips are an important way of expressing extra appreciation for a job well done.
Artists don’t make as much money as the price of the tattoo suggests. A tip usually means a lot to the artist. Even a small one of $5 will be appreciated.
The more generous you are the more the artist will remember you with fondness and will be happy to see you the next time you want their services .