Works of art with a beautiful/idyllic aesthetic might use harmonious colors, balanced compositions, organic shapes, perhaps flowing lines/brushstrokes. If representational, the works might depict characters or scenes that are naturally appealing, at ease, and in full health/ full bloom.
Artists might manifest a beautiful aesthetic in a piece because it suits their temperament and their appreciation for life, or the artist might choose this aesthetic as a reflection of the characters or settings being portrayed. A beautiful aesthetic might also be adopted to make a piece suitable for a setting that demands something lovely.
Featured: The Kiss by Gustav Klimt.