One of the easiest ways to make writing look better is to use synonyms.
Avoid ‘kindergarten words’
In western schools one of the first things writing teachers teach is to avoid ‘kindergarten’ words.
An example of these words:
good: positive, grand, excellent, wonderful
bad: atrocious, dire, pitiful
big: vast, enormous, giant, great
small: minute, tiny, miniscule
clever: intelligent, wise, genius, knowledgeable
stupid: idiotic, moronic, poorly devised
go: head, visit, frequent
say: declare, announce
do: act, perform
have: own, possess
build: construct, erect, develop
work: employment, labour, job, career
music: tune, piece, melody
An in-depth list of synonyms can be found here.