The face encompasses proportions between its individual elements (forehead, eyebrows, eyes, nose, mouth and chin) which determine facial harmony and inherited beauty.
All human beings possess the same elements and yet no two of them are exactly alike, including identical twins. To me this is one of the most fascinating mysteries of human beauty.
The correct proportion between these elements is what determines whether a face is handsome or pretty. Often variances in millimeters between these elements make the difference between harmony or imbalance.
The chin has an important function within this aesthetic and facial beauty.
The positioning of the chin, a bit to the front or backwards is important to determine the correct face proportions. The chin should touch an imaginary vertical line that passes the top of the nose. Due to that, there is an important relation between chin and nose.