Overhead lighting is flattering. Mankind has experienced light from above since the beginning. Lowered light is unnatural. Watch old horror movies; they create the illusion of dreadfulness using low lights. Overhead lights create shadows that must be mitigated.
This type (direction) of light simulates afternoon sun. When doing portraiture we mitigate by inducing a "fill" light. This is a subordinate lamp at about lens height. The classic portrait lighting is to adjust the ratio of the "main" (key lamp or sun), to the "fill". Generally we adjust the "fill" and set it so that it contributes 50% (subordinate by 1 f-stop). This creates a 3:1 lighting ratio.
Why 3:1? Say the "main" contributes 1000 units of light and the "fill" 500 units of light. The frontal areas of the face receive light from both while the shadows only receive light from the "fill". Thus the frontal facial area receives 1000 + 500 = 1500 units. The shadows receive only 500 units. The ratio is 1500 : 500. This can be considered to be a fraction which can be reduced. We divide both sides by 500 thus; the ratio is 3:1. This is about right.
If the "fill" is cut in half again, making it 2 f-stops subordinate = 250 units, the shadows receive 250 units, the frontal area 1000 units. The ratio is 1250 : 250 = 5:1 (more contrast).
Reduce the "fill" again so that it is 3 f-stops subordinate, the frontal areas receive 1000 units from the "main" + 125 units from the "fill". The ratio is 1125 units to 125 units written as 1125 : 125 and reduces to 9:1 a higher contrast theatrical lighting (quite masculine).