When a visual artist identifies where they need to be specific and where they can generalize, then the freedom to invent and have fun with the subject is revealed. Most often, these moments involve developing an understanding of how much descriptive information the hypothetical viewer really needs.
If your painting is green in the lower area and blue in the upper, chances are it's a landscape. With that important piece of information gained it doesn't take much to tell what the dancing forms below the sky actually are.
Here's an example;