A formidable Renaissance female astronomer from a fictional 16th century Italian academy stands in her candlelit observatory during a dramatic comet sighting, wearing layered black silk robes with gold astronomical thread embroidery and a seed pearl hairnet, her flaming red hair flowing as she grips a brass astrolabe and points toward the heavens through a wooden telescope, fierce intellectual expression, dramatic deep indigo and silver celestial illumination contrasting warm amber candlelight from surrounding brass sconces, rich details of celestial globes and star charts scattered across her desk, oil painting texture with digital precision, powerful dignified three-quarter composition against epic night sky with blazing comet and emerging constellations, 4k hyperdetailed digital art