Then you have to ask yourself: What should I promise to my consumers?

This is very important. No one will buy your things if there is no commitment. The more specific the commitment, the better.

The promise of "making you beautiful" is not as powerful as "removing spots on your face" and "making your skin white and shiny", "saving you money" and "saving you 10 yuan"!

Don't write down promises that you can't believe. What is the guarantee of your promise? You should think it over in the copy.