Faith, Intelligence, Strength & Dex will be removed from the game, and a class system will be implemented
Take a look here: First preview of the Class screen.
In a way your ideas are already implemented In the New Class System except that classes are implemented through weapons and are not an integral part of the character. In any case, I don’t see much point in adding tattoos unless it’s to improve the character’s appearance.
We already have a lot of ways to give ourselves buffs: armor, weapons, rings and now even class-specific abilities. Considering that enchantments still need to be improved (these are my ideas to improve the system: The RNG Problem, Enchantment System Vs Gem System (Major Edits)), even if your idea is nice I don’t think it’s good for this game.