Depict an intricate diorama featuring a photorealistic lion standing majestically in a sunlit savannah. The lion's mane, with its rich golden and brown hues, should be meticulously detailed, and its eyes should reflect strength and wisdom. The surrounding savannah, with tall grasses and acacia trees, adds depth to the scene. Utilize vibrant neon hues and cinematic lighting to enhance the intricate details. Render the image in a holographic digital style, capturing the bioluminescent glow that illuminates the lion and its surroundings. Ensure the setting includes circular windows with warm light filtering through. The overall composition should be a true masterpiece, with UHD resolution and studio- quality detail