The long and the short of it is, if the person wants to make a go of it, they can sue you if you use their picture for anything that they (or courts) deem to harm, them in any way, be it physically, emotionally, monetarily, etc...
Also, remember if they are wearing any branded clothes or items, you can be sued over that as well (Nike swooshes, Adidas logos, etc...)
Getty Images has a useful help section for content submitters.
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