The phrase "art sparing" implies a certain level of restraint or minimalism when it comes to creating or expressing oneself artistically. Antonyms for this phrase might include "bold," "elaborate," "lavish," or "ornate," which suggest a more extravagant and showy approach to art. Other opposite words could include "excessive," "overwrought," "overdone," or "bombastic," which depict an exaggerated or hyperbolic style of artistic expression. In contrast, "simple," "plain," "modest," or "understated" could all be seen as antonyms for "art sparing," suggesting a more restrained, subtle, and subdued artistic approach.