{
  "model": "bytedance/seedream-5.0-pro",
  "size": "1.5K",
  "response_format": "b64_json",
  "output_format": "png",
  "watermark": false,
  "optimize_prompt_options": {
    "mode": "fast"
  },
  "image": "data:image/png;base64,<base64 bytes of inputs/vase-layer.png>",
  "background": "transparent",
  "prompt": "Change this terracotta vase to a matte cobalt-blue ceramic vase. Preserve the silhouette, texture, lighting and transparent background. Keep only the vase, with no additional objects or backdrop."
}