Well, I had mine done because mine own brows were very thin and sparse, so there wasn't really any question of needing to have them plucked or threaded. If you have enough brows to need threading, I'd struggle a bit to see what you would be getting from the tattoo?
Since my brows were always very thin, i hesitated over getting a tattoo, as heavy, lush brooke shields brows would look , well, silly and out of place against my colouring. I was delighted with the end result, as it means that i have some definition around the brow area.p, much more than before. Others with whom i shared the waiting room, had lost all their hair, head and brows entirely.
There are lots of examples on the site www.karenbetts.co.uk, as part of the deal is that she takes a snap of the end result. Not enough to identify the person, just the eyes and brows. That would give you some idea of the range of possible outcomes. I took lots of pictures of my end results, but am loath to post a full face picture of myself on an anonymous forum. HTH