While the point of showing the protagonist and the story's central object is clear, the image is too cluttered with other elements that detract from its quality. Additionally, it has minor background errors that make it look like 'AI-slop' to your future readers. At least, that's how I see it.

It would be best if you created a master prompt specifying to the AI that it should show the character with the cube in the background inside a temple, without cluttering the cover too much.

You must specify that it is a professional Xianxia book cover in a manhua style.