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Read non-comedy books. Learn from other authors how to handle those things. (This is how writers learn how to write.) Also, remember that you don't need to describe how your characters look unless...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/32970 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Read non-comedy books. Learn from other authors how to handle those things. (This is how writers learn how to write.) Also, remember that you don't need to describe how your characters look unless it's relevant to the story. In my own reading it's rare to see a character's physical bodies described.