There are several synonyms for the phrase "art authorized," which means that something has been officially approved or sanctioned in the context of art. Some possible synonyms include "approved," "endorsed," "validated," "certified," and "legitimized." These words all convey the idea that a particular work of art has received some kind of official stamp of approval, either from a recognized authority or from a group of experts in the field. When a work of art is authorized in this way, it gains prestige and credibility, which can help to promote the artist's reputation and boost the value of the artwork itself.