For a design to be registrable, it must:

1. be new, that is, not be the same as, nor only differs in immaterial features from,  a design registered or published or disclosed in respect of the same or any other article, in the Hong Kong SAR or elsewhere in the world;
2. appeal to and be judged by the eye;
3. be applied to a product by any industrial process.

You need to keep your design confidential at all times until you file an application to register it because disclosure of a design before filing an application may destroy its novelty.