Раковина наутилуса — вариант 2

Use case: product-mockup. Use the supplied image as the exact reference. Create one isolated transparent PNG of the same single nautilus shell, with a visible coiled spiral, fine brown striping on cream shell, and broad opening at the right. Explicit palette: ivory, warm cream, light tan and chestnut-brown narrow stripes, subtle natural luster. Pose/angle: three-quarter close view aimed toward the spiral face, with shell opening turned toward the right/front. Framing: medium close product shot showing the complete shell centered in square frame with transparent margin. Preserve polished calcium shell surface and soft upper-left studio light. Make a noticeably different yet plausible shape sibling: slightly more elongated oval outer whorl and a narrower, deeper-looking aperture, while keeping the central spiral and nautilus identity clearly recognizable. Genuine transparent alpha outside and through the shell opening; no ocean scene, support, floor, backdrop, external shadow, text or extras.