Illustrate a serene rooftop garden in a futuristic city, surrounded by neon-lit skyscrapers and reflective surfaces. The artistic style should be a blend of tranquility and modernity, with a focus on contrast and reflections. Use digital painting as the medium to achieve a detailed and vibrant look. The background features the city skyline with neon signs and holograms, while the foreground includes a lush garden with futuristic plants and a reflective pond. The focus point is a modern, reflective sculpture in the center of the garden, capturing the neon lights and reflections of the surrounding buildings. The lighting setup should include a mix of soft ambient lighting and bright neon lights, casting dynamic reflections and shadows. Apply a color grading effect to enhance the neon hues and a subtle vignette to draw attention to the central elements. The overall atmosphere should be a blend of serene and futuristic, creating a unique and engaging visual experience.