Poorly rendered or unrealistic depiction of planets and the universe, lack of detail or depth in the artwork, unappealing color choices, lack of variation in planet designs, unrecognizable or unconvincing planetary textures, cluttered composition, lack of cohesion between elements, lack of storytelling or narrative elements, dull or uninteresting star clusters or nebulas, lack of a sense of wonder or awe, unappealing art style, low-quality image, pixelated details.