On Oct 2, [more than 6000 participants](http://gandhiarmy.org/) (humans) are gathering to create the largest portrait of [Mahatma Gandhi.](http://en.wikipedia.org/wiki/Mahatma_Gandhi) Once created, how do we say this without bringing any ambiguity?

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> Gandhi's largest portrait was created by humans? (But then, only humans create/draw a portrait)
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> Human-made Gandhi's largest portrait in the world (But then, human made does not talk about what it is actually)
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> Humans shaped in Gandhi's portrait?
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I'm clueless. What is the proper way to tell this?