How can I accurately estimate this curly-haired guy’s height from a photo?

How can I accurately estimate this curly-haired guy’s height from a photo?

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6ft 3
6ft 4
6ft 2
6 1
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A total of 15 votes were cast: 15 girls and 0 guys. See detailed results
How can I accurately estimate this curly-haired guy’s height from a photo?
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