Which bone is used as a reference to shape the eyebrow?

The orbital bone is used as a reference to shape the eyebrow because it is located around the eye area and provides a natural contour for brow design. The position and structure of the orbital bone help beauticians and brow artists determine where the eyebrow should begin, arch, and end to enhance a person’s facial features. Proper shaping involves understanding how the brow interacts with the surrounding bones and facial structure, particularly the orbital region.

Other bones, such as the nasal, mandible, and frontal, do not provide as direct a relation to the brow's shape and structure in the way that the orbital bone does, as they are located further away from the eye area where eyebrows are situated. Therefore, focusing on the orbital bone allows for more precise and aesthetically pleasing eyebrow shaping.