An idea: maybe some sort of wrap one-piece with additional pieces added to the angelic side and simplicity on the demon side? Since the angelic side has no tattoos, you can add intricacy to the garment on that side to balance the tats on the demonic? ^^ (feel free to ignore ofc! Just a thought ;u;/)

oh she actually does have tattoos on the left! theyre just white ink so theyre super subtle but the same principle you suggest still applies! tysm!