portrayal has 9 distinct synonyms spread across 5 of its 5 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a word picture of a person's appearance and character
acting the part of a character on stage; dramatically representing the character by speech and action and gesture
a representation by picture or portraiture
any likeness of a person, in any medium
“the photographer made excellent portraits”
representation by drawing or painting etc
Synonyms, antonyms and the broader and narrower relations for portrayal come from Princeton University’s WordNet. Full sources and licences.