Well as they say "beauty lies in the eyes of beholder", how you look at a particular human being is how you generally feel about living beings. There maybe certain factors that make your appearance the way it is and one of them certainly would be your past karmas, but there is another aspect of the same thing, it is said that a soul itself selects a body, circumstances/living conditions it wants to enter in order to experience something specific, gain from it and move ahead to the next level.
Some of the factors that certainly define your appearance are:
Genes: Genes you inherit from your parents.
Geographical locations: Plains, mountains, desserts or extreme cold regions.
Climatic conditions: Hot, humid, cold or moderate.
Food you consume: Balanced or un-balanced diet.
The Indian poet Kalidas states that, that which appears fresher, newer and more lustrous each moment is beautiful.
क्षणे क्षणे यन्नवतां उपैति तदेव रूपं रमणीयताया: । नव नवोन्मेषशालिनी
रमणीयता । – कालीदास
The Upanishads state,
‘That which is pure and eternally Blissful is beautiful (सत्यं शिवं
सुंदरम्)’. True beauty never withers away. The soul principle which
is the same as Brahma, God (Îshvar) or the individual soul is the only
principle which has eternal existence, bliss and beauty.
To appreciate the beauty of God, a seeker must raise himself to the highest level of consciousness.
It is said, ‘One can truly worship Lord Shiva only when one becomes
Lord Shiva Himself (शिवो भूत्वा शिवं यज्ञेत् ।)’. One has to tune
oneself to the frequency of one’s deity before one can love and
appreciate its beauty. For most people, the idol of Lord Viòhòhal is
merely an idol. But Saint Tukaram considered the same idol as the most
beautiful, manifest God Himself.
Every object or an individual has an aura i.e. it radiates energy of a particular frequency. When the frequency of the observer matches that of the object or the individual, that particular object or individual appears beautiful to the observer.
As God is beautiful, an individual with divine qualities such as serenity, compassion, kindness, goodwill, contentment appears beautiful. On the other hand, an individual with bad qualities such as anger, vengeance, hostility, violent nature, etc. appears ugly and ferocious. Refer