Identifying a high-quality glaze on a porcelain sculpture requires a keen eye for detail and an understanding of ceramic artistry. Here are key indicators to look for:

1. Smooth and Even Texture: A premium glaze should feel smooth to the touch, without bumps, cracks, or uneven areas. Run your fingers lightly over the surface to detect imperfections.

2. Vibrant and Consistent Color: High-quality glazes exhibit rich, uniform colors without fading or blotchiness. Hold the piece under natural light to assess its clarity and depth.

3. Lustrous Finish: A well-fired glaze will have a subtle sheen, reflecting light evenly. Avoid dull or overly glossy surfaces, as these may indicate poor craftsmanship.

4. Durability: Tap the sculpture gently—it should produce a clear, resonant sound. A muffled tone might suggest weak glaze adhesion or underlying flaws.

5. Artistic Detail: Examine intricate areas like edges and carvings. A superior glaze will enhance these details without obscuring them.

By mastering these techniques, you can confidently evaluate the quality of glazes on porcelain sculptures, whether for collection or creation.