I only usually choose to describe a character if i want him or her to have certain features that symbolize their personality. for example if they are a cold person i may give them "hard-blue eyes". I won't describe any features unless they are lending something to the story in this fashion, so in my example i may just describe the hard-blue eyes and perhaps the pointy-white knuckles, and leave everything else up to the imagination of the reader (which i think is far more rewarding and satisfying to read).
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