The glow around Jesus is a sign of the skillful technique of the painter, period. Nothing more, nothing less.
A lot of medieval painters used to draw a literal gold circle (halo) above his head and its certainly not how he walked around in everyday life.
None of the examples in the link were created by a contemporary of Jesus and they are certainly not photographs so theres really no telling how he looked in reality.
There used to be more paintings
depicting him with blue eyes and blondish hair which is due far more to cultural prejudice than anything resembling reality.
More modern depictions where he looks the way a typical Jewish person born in the Middle East would look are much closer to hitting the mark.
But theres still no evidence for the face glow.