Creating a flawless, glass-like finish on porcelain sculptures requires precision, patience, and the right techniques. Here are the most effective methods to achieve a professional-grade result:

1. Sanding and Polishing: Begin with wet sanding using progressively finer grits (from 400 to 3000) to eliminate imperfections. Follow with a high-speed polishing wheel and diamond paste for a mirror-like shine.

2. Ceramic Glazing: Apply a high-gloss glaze evenly and fire the sculpture in a kiln. Multiple thin layers yield better results than a single thick coat.

3. Burnishing: Use a smooth stone or agate tool to compress the porcelain surface, enhancing its natural sheen before firing.

4. Sealing with Resin or Wax: After polishing, seal the sculpture with a clear epoxy resin or carnauba wax to protect the finish and amplify gloss.

5. Buffing with Microfiber: A final hand-buffing with a microfiber cloth removes residual marks and enhances reflectivity.

For optimal results, combine these techniques and work in a dust-free environment to avoid blemishes. Consistency and attention to detail are key to achieving that coveted glass-like perfection.