Rejection issue

Not true, with an important caveat: don't spam by submitting similar images. For example, the same image multiple times but with different colored backgrounds. Or the same image of a plate of food with the food arranged slightly different in each image. Or, if you submit AI, half a dozen very similar images based on the same prompt, all of which are submitted as is, without editing. Use your judgment. When it comes to submitting the same subject (let's say, a fox), make sure it is photographed in different environments, in varying degrees of poses, or at different angles, and never submit more than two or three.