Does an adjective phrase modify a noun or a pronoun; an adjective; a verb or an adverb; or a verb, an adverb, or an adjective?
An adjective phrase modifies a noun or a pronoun.
The other choices would require an adverb or adverb phrase.
Diminutive in stature and soft of voice, Michelle was able to command the attention of the entire room with her enchanting and humorous wit.
In this sentence the adjective phrase: Diminutive in stature and soft of voice, modifies or describes the proper noun Michelle.
In this sentence, "Michelle" could also be replaced with the pronoun "she".