Celeste, the Blue-Winged Sword Knight

A fantasy illustration of a sword knight girl with blue-silver hair standing against a deep navy night sky, radiating an intense presence. Her platinum blue hair extends to her waist and flows in the wind, while her cold, sharp blue eyes display the dignity of a cool beauty. She wears white and silver light armor, with blue gemstones and cross emblems engraved on the armor plates protecting her chest and shoulders, emphasizing the image of a sacred knight. A short navy-colored pleated skirt is visible beneath the armor, while arm guards with gold trim and black gloves suggest readiness for battle. In the background, blue starlight shining in a cross pattern and scattered golden particles create a magical atmosphere, with the overall cold and mystical blue tones completing the guardian of the night aesthetic. A piece that maximizes the character's appeal through detailed armor rendering, hair expression, and a calm yet resolute expression.