A celestial star guardian with flowing silver hair and wings of woven nebula gas, descending through an endless cosmic ocean of swirling galaxies at twilight, expressive luminous violet eyes with detailed star light reflections, cel-shaded with bold black outlines, dynamic downward composition with floating star dust particles, deep cosmic indigo and bright gold magenta palette with soft nebula glow, ethereal serene mood, scattered comet tail wisps and distant planetary silhouettes, cosmic mythology being concept art with soft bokeh of distant galaxy spirals