WHY MUSLIMS LOOKING GOOD AND NOOR ON THEIR FACES?

Assalamalaikum friends  WHY NOOR(LIGHT) ON THE FACES OF GOOD MUSLIMS.
So the guidance of Allah swt is described as light .....Y, because it lighten the hearts of people ...by Truth (opposite of ignorance) ..Truth about who is their creator, what is his noble perfect attribtes , how to live a pure decent life full of light and happiness....being close to Allah swt; (Allah is the light of heavens and earth.....) .Before prophet,the muhammad swt was also the noor.

Reading NAMAAZ(the muslims prayer)regularly Allah tabarakwahtallah lighten his/her faces.

Pic credit:Afroz shaykh