Regal Black Cat in Victorian Interior

Create a vertical, photorealistic fine-art portrait of a regal {argument name="cat color" default="solid black"} cat sitting upright on an ornate dark purple brocade cushion in a luxurious Victorian gothic interior. The cat is the single main subject, centered slightly left, with sleek glossy fur, tall pointed ears, long whiskers, alert posture, and pale golden eyes gazing off to the left. Around its neck is an antique gold filigree necklace with a dark oval gemstone pendant, giving the cat an aristocratic, mysterious look. The setting is dim and elegant: deep plum velvet curtains with a gold tassel tieback on the left, a dark charcoal wall, a partially visible gilded picture frame in the upper right, and an ornate gold side table in soft focus behind the cat holding a brass vase with dark purple flowers and a small candleholder-like ornament. Include exactly these visible background decor elements: 1 large curtain with 1 tassel tieback, 1 gilded wall frame, 1 ornate side table, 1 brass flower vase, 1 bunch of dark purple flowers, 1 small gold ornament, and 1 extra purple cushion at the lower right. Use a moody chiaroscuro lighting style with soft directional light from the left highlighting the cat’s face, eyes, fur texture, and jewelry, while the background falls into natural shallow-depth-of-field blur. Color palette: black, deep violet, antique gold, charcoal, and muted burgundy. Render as high-end editorial pet photography, ultra-detailed fur, realistic anatomy, elegant composition, no text, no watermark, no extra animals.