Do not include any signs of pollution or destruction of the environment, such as smog or oil spills. The Earth should not be shown in a distorted or unrealistic manner, and the lighting should not be too dark or too bright. The image should not have a flat or cartoonish look, and the artist should not be a beginner or amateur. Any watermarks or signatures should be removed, and the focus of the image should not be cut off or out of frame.