Tipping is not a common practice in Korea, including in tattoo parlors. However, if you feel that your tattoo artist has gone above and beyond, it's always appreciated to show your gratitude with a small tip. The average tip amount for tattoos in Korea is around 10% of the total cost of the tattoo. Tipping is more common in lower-end tattoo parlors where prices are generally lower, and the artists may not be making as much money. If you don't feel comfortable tipping or if it's not part of your budget, there are other ways to show your appreciation for your tattoo artist.