Transform the provided image of a subject into a dramatic, high-fidelity gothic vampire portrait, rendered in the opulent style of 18th-century Romantic oil painting. The subject should have an aristocratic, melancholic expression, with alabaster skin, subtle yet sharp fangs, and piercing, dark eyes. They must wear a lavish, flowing velvet cape, either deep crimson or midnight black, draped dramatically to create a sense of mystery and power. The setting should be an ancient, ominous castle interior, with ethereal moonlight streaming through a gothic archway, casting long, dramatic shadows. Ensure the lighting is stark and theatrical, emphasizing facial contours and the rich texture of the cape, while preserving a classic portrait composition.