Anything that looks too Earth-like or familiar, such as recognizable landscapes, human-like figures, earthly animals or plants, visible watermarks, logos, or text, repetitive or mundane elements, earthly references, conventional lighting or colors, predictable compositions, generic features, or any element that does not exude the essence of an alien and otherworldly landscape. Embrace the unknown and let your creativity run wild as you paint a picture of a realm that exists beyond our wildest dreams.