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To act like a mermaid at school, start by dressing in colors that remind you of the ocean, like bright blue or aqua. You could also try a deep blue or purple form-fitting skirt that mimics a mermaid’s fin. Then, consider growing out your hair and adding salt spray when you style it to look like you just left the beach. To perfect to your mermaid look, use an iridescent blue or green polish to imitate the look of fish scales on your fingernails. For tips on how to do your makeup to look like a mermaid, read on!