A Portrait (n.) is not made by similarity, for it must make sense to speak of a bad portrait: the shadow has to be capable of representing things as they are not.
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A Portrait (n.) meant to show N but drawn, by unconscious forces, as a fine likeness of M — is it a bad picture of N?
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A Portrait (n.) recognised — that's Mr N! — could be taken for madness: he sees paper with black lines on it and takes it for a man.
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A Portrait (n.) is made one by being so designated in the catalogue.
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A Portrait (n.) is not made by similarity; that it represents N may rest on N's name written beneath it.
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