A premium product advertising image with a vertical composit...

A premium product advertising image with a vertical composition. Two cylindrical aroma diffuser devices aligned vertically in the center. Top product: advanced model, slightly brighter blue ambient light, refined details. Bottom product: basic model, softer blue light, clean and minimal. A subtle mist and light flow connects the top and bottom devices, symbolizing shared origin and evolution. Dark gradient background, minimalistic, luxury, calm, Japanese aesthetic. Soft cinematic lighting, high contrast, ultra clean. No text, no logo, no people. Photorealistic, high-end commercial product photography, 4K quality.