Proportion issues with eyes, misplaced facial features, unrealistic hair, facial expressions that appear forced, lack of believable creases in clothing, mismatched shading styles, lack of variety in body shapes, loss perspective, inconsistencies in body proportions, incorrect drawing of hands or feet, unconvincing facial perspective, unexpressive eye expressions, oversimplified details, unstable contour lines, excessive use of glow effects, combinations of discordant colors, settings without a sense of depth, lack of coherence in the direction of the characters' gaze.