Writer research: What annoys you about tattoos in fiction?

I didn't see anything forbidding this in the rules, but please let me know if I missed something.

I write fantasy, supernatural, and scifi fiction and tattoos and body mods are a pretty common feature in the genres. I'm about to start on a pretty plot-important scene featuring tebori, and I wanted to see what common mistakes writers are making involving tattoos. I love tattoos but don't have any myself (I have *bad* ADHD and I don't like anything long enough to want to look at it forever.)

I'm obviously doing research myself, but I like to supplement that with primary sources from experts.

Questions specific to my scene:

- what happens to the body during a long tattoo session? I know can be different for everyone, but what's *your* experience? Meditative? Exhausting? Blood sugar crashing? Pain high?

- can a tattoo heal *too* quickly? Can your body reject the ink or break it down?

- what is tattoo ink? Specifically black, but any ink? Is it pigment or dye based? I know carbon/lamp black is traditional in many places, but what other pigments are common? What carrier and binders are used? I'm assuming that these aren't acrylic inks, but I would love to know if they're water-based, oil-based, etc.

- assuming magical stamina and healing, artist and person being tattooed never get tired or tap out, what can go wrong during a marathon session?

- characters are using tebori because electricity is not an option. What makes that process significantly different from modern tattoo machines?

- Are there different practices that might be better suited to a full back tattoo in a (for lack of better word) calligraphy style? Think Arabic script around a compass rose.

- (free space) what do writers get wrong? What's your tattoo experience? If you could wave a magic wand what would you remove from the experience of getting a tattoo?