I'll post two of mine, of the three stories I have, and explain the different approach I took with each. Not saying is any good, but I'll go and explain my intentions at least
Nicollas is Brazilian boy that, when involved in a bombastic accident at a toy shop, receives great powers!
Now, he defends justice and goodness in his two cities as MAXIBOY!
These are his bold adventures!
From Maxiboy!
Since this was a straightforward superhero story, I structured it as a little superhero origin description, like the ones you find out at the beginning of each comic. So yeah, pretty broad, straightforward stuff.
Orlando is one of the most powerful mages on the planet.
But only in this universe.
In another corner of the Multiverse, Orlando is a young man in trouble.
Isolated inside his little world, he starts to listen to music that shouldn't exist. There's something on the rise.
Now Orlando has to save Orlando,
but things may not be what they seem.
What is at stake? Who is the other Orlando? What is the Ghost Empire? Who watches the endless angles? Who are you?
What's behind Ghost Music?
From Mantra - Ghost Music
This one is like, super long and indulgent. In a way, the verbose style has to do with the mood of the story itself.
It also tells the basic synopsis of the story, but also complicates things a little. I wanted to act like a ''teaser'', and to act as part of the story itself, in a way.
But yeah, as people said, at least to me a good description is a quick synopsis. It goes a little about tone, about the basics of the story and stuff. I honestly don't need to know your whole story or your many characters or things like this, just the bare bones, the premise and the basics about your MC.
Good luck!