This is a really beautiful and interesting design that incorporates some very fancy scroll-work designs and what looks to be a scroll-work butterfly.
It is made especially striking by the bold lines mixed with the finer lines inside the pattern and interlocking throughout. It is nicely balanced and evenly spaced on the side of her torso, as well.
I really like this tattoo as black work and am pleased to see it without color added. It ends up being much more striking this way.