My personal favorite: Lauren Bacille. Those brows gave her an amazingly sultry, strong, and at the same time, very feminine appeal.
Needless to say, eyebrows are the framework of the face, and the best way to illuminate the attitude & soul in your eyes. With permanent makeup, people who, in many cases, have not ever really had eyebrows-can. The beauty of this truly lies in the technicians ability to create a natural appealing brow.
In a situation where there isn't hair present on the eyebrow, a tattoo technique called hair stroke, can be used to mimic the look of real hair. The results that can be achieved with this method can be quite stunning. This technique is also used with sparse areas within the brow.
When it comes to Permanent Makeup, gone are the days of stenciled on, harshly drawn lines. This still happens, and I see clients for corrections of this often. There are special cases however, where I will do a soft fully shaded brow, for example when a client already has a lot of eyebrow hair, but desires a slight darkening of their brow. this technique would mimic a shadow effect.
What is most important, is seeking a technician who has a style that suits your taste. All technicians will have a unique style & preference as to what they see fit for shaping & coloring brows. Meeting the technician in person, and reviewing examples if their work is always the best approach.