But you're not mathematically perfect. Credit where it is due, you really are beautiful. And that happens when your dad is king and he marries the most beautiful girls in other people's kingdoms. You're well guaranteed a good looking brood. And his father did the same thing. So there you are the whole lot are known for their good looks.
Plus they had the money of God.
Artist types prefer to flatter their subjects and their patrons prefer that too. Egyptian artists worked out proportions early on. These proportions are transferred by grid with chalk line, basically, onto walls, ceilings, floors, column, for paintings and bas reliefs, and for statues. The grids changed over time and ideal changed too, but they stuck with idea of features falling on points of a grid. The number of lines in the grid for full figures changed over dynasties but not by much. Coincidentally the artistic grid reverted to Old Kingdom style for this person's son's tomb, pharaoh Tutankhamun. A switch to an early grid is obvious. The figures look old-timey even for then and it signaled a rejection of the Armenian stye developed under his father's disruptive reign.
This is showing what they did, not how they did it. The grid comes first before the face is formed. Here we have the face first, and the grid is shown. The artist would draw a grid, shape the face inside the grid, put the mouth where it goes in the right size, the nose, eyes, forehead. The same holds for the torso, arms, legs, hands and feet. This same manner of discovering point and line placements allows small works on papyrus to be transferred to walls and even to the scale of monuments.