Yes, it is standard to tip a tattoo artist if they do a good job... I usually throw in an extra $20, but it really depends on how much the tattoo cost, how long it took, etc. My latest piece is a "work in progress" that's already taken 3 sittings of about 2-3 hours each. I've given the artist an extra $20 at every session, bringing the total to $60 so far. He's giving me a discount ($100/hr instead of his usual $150/hr) and doing an amazing job, so that's totally worth it!
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