The verb embellish means to decorate something with features or patterns so it will look more attractive.
Synonyms are adorn, dress up, embroider, or exaggerate.
The word origins from Old French (14th century) embelliss-, stem of embellir meaning “make beautiful, ornament”. It is derived out of its assimilated form of en- plus bel “beautiful” from Latin bellus meaning “handsome, pretty, fine”.
You can add an extra tuft of feathers at the side of the hat, or embellish the design in other ways.
They did much to embellish the whole city as it progressed.
The wall was embellished with flowers and ribbons.