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Our main Character Zara could look like this, with Big messy curly hair and thick glasses. She could also wear braces..
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A close up shot of zaras like the above image can be used to when zaras comes back from the dead to haunt her killers
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The 3 girls who bully zara  and cause her death could  look like the mean girls. Typical high school teenagers who are shallow and  bully those people who are different.