I tip 20 base. If I get stupid hooked up for being a regular I can tip %200-300. If I eat and drink all night with a friend or two and my tab is 20 at the end of the night I can tip 60 nice and drunk. Bartender makes out, I make out, we all win.
I got hooked up on the price of my first tattoo. I was freshly 18, I didn't know any better and didn't tip shit. Zero. I still feel bad about it almost a decade later. But you go out to eat/drink all the time and you know to tip. First time in a tattoo shop? I had no clue.