Bold brows means natural looking brows, so the brows are practically shaped by themselves. All you have to do is to follow their form and remove, if you want, the hairs that don’t follow the shape you are going for.
If you want to make your brows fuller, fill them with small strokes, using a brow pencil or powder or matte eyeshadow. Opt for a bit lighter than your hair color, if your are brunette and a bit darker, if you are blonde. Bold, yet groomed brows, so finish with clear mascara or a brow wax.