I have a small flower like tatto called a 'Dina" just above where my old brand was (it faded over the years), the tatto is much clearer and much prettier and safer than my brand ever was btw.

What I would avoid at all costs, are tattos of peoples names, terms such as "slut", slave, cock sucker, etc etc as well as faces of dominants or non family members, partners etc.

A tatto can be removed and with current tech even redone, so its not exactly permament but its still, nothing you want to have to change later eaither so common sence applies.