Tattoo on the back for all players?

[Imoen]

From my experience in editing models in MMOS and doing research into model editing (World of Warcraft) you can easily add things to model textures without affecting clothing, etc...

All they'd do is take an existing texture and draw onto it the tattoo, then, in-game, it will appear in place when you patch in the file. I would show you examples but I'm pretty sure I'll get banned for it. I'd also mention some "break throughs" on that aspect, but again, can't mention the "blackmarket."

An in-game example would be the face prints, Au'ra scales and my miqo'te face tattoos. (I think that's what they are anyway.) The tattoos would just be those but on the torso instead of the face. Only issue then is you, the player, will have to slut-walk to even show off your body tattoos.

The heads are usually separate models. With their own UV layouts and textures, and generally are not Mirrored. (At least now a days) With that said, I have no idea if they are mirroring heads in this game or not. I'm like 95% sure the rogue gear tattoo is a duplicated piece of geometry with a push modifier on it, and duplicated vertex weighting to avoid clipping on the body.