He probably used some kind of imaging device to at least get a wireframe of his head shape upon which textures and tonality were built – and those also could have used photographs as a source. In any case, though, I’m not sure how creating a realistic 3D model is so different from a chemical process of light hitting film, or the accepted digital process of photons triggering ccds. If the end result looks enough like him to satisfy the identification criteria for the given application, it should be fine. There’s a level of abstraction in all image reproduction.
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