Self-Perception
Show what a character loves, loathes, and knows about themselves.
External Perception
Show the beauty and faults that secondary characters note about your character.
Be Subtle
Work in your character's appearance at natural points throughout the story.
Avoid Cliches
Don't infodump character descriptions, have a character describe their reflections, or utilize overused character tropes.
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Writing tips
RandomThis book contains -Words to use instead of said, says, went, etc -Personalities -Characteristics - words to describe movement, looks, body language and more. and a whole lot of other things.