Flat, dull colors, lack of depth, unrealistic lighting, inconsistent perspective, stiff pose, generic space background, pixelation, lack of dynamic movement, unnatural horse anatomy, messy composition, oversaturation, lack of star details, artificial-looking mane, lack of celestial elements, low-quality textures, unnatural shadows, overly bright or dark areas, unclear focal point, lack of detailing in cosmic dust, unrealistic proportions, lack of grace in galloping motion.