Who found the tattoo artist? Give a pointer where he is. (The Witcher 3: Wild Hunt)

Maybe a sign master?
So he is near the mill in the Stone Hearts.

Hear it for the first time. Where does this infa come from?

VladeSXIII
In general, in the Witcher, a tattoo can be done according to a quest in 2 parts, and nowhere else. The Hangover quest is called. You can take it in Flotzam, if you come to the guys Roche.
PS: After that, they will offer to reduce it when talking with any magician.

http://www.playground.ru/blogs/witcher_3_wild_hunt/informatsiya_o_dopolnenii_vedmak_3_dikaya_ohota_krov_i_vino-192631/

Info from here Miscellaneous, line 3.
So I'll find out =)

VladeSXIII
Here you will not learn about the serious twists of the storyline. Letters, contracts and dialogues will be deliberately not mentioned so as not to disturb the feeling of novelty from the expansion. According to the source, the following information was pulled from the 1.12 patch files, mostly from the Polish localization. With the 1.12.1 update, most of the information has been removed.
PS: From the same kaermorhen where they got the info from.
PSS: So no campaign.

Vorkimarh
es, abidna.
Well, okay, thanks for the clarification =)