First: Understanding the meaning of the text. A good poem must have a good artistic conception (a good poem does not necessarily mean happy and joyful, it can also be about the country and the people's longing...) for people to read. Just know what you want to express, attracting people to enter and feel like you are in it. Second: the lyrics are beautiful and elegant. A good poem must have good words and sentences (it doesn’t have to be gorgeous! But it must be the most appropriate)