The lack of images in the China Conservatory of Music piano exam certification video may be due to the following reasons:

1. Network problem: The video stream may not be loaded or transmitted correctly, you can try to reload or restart browser.

2. Browser issues: Some browsers may not support video streaming. You can try using other browsers or devices to watch.

3. Video format issues: The certified video may be in a specific video format and requires a specific player or converter to be viewed. You can try to use a player or converter that supports the video format.

4. Equipment problems: If you are using a mobile device to watch the certification video, you may need to check whether the device camera is working properly. You can try to use other devices to watch.

If the above methods cannot solve the problem, it is recommended to contact the China Conservatory of Music customer service or technical support team for more detailed and professional help.