Design a contemporary 3D promotional poster based on my uploaded photo for the face. The face must remain 100% consistent—same features, skin tone, and facial structure. I am sitting confidently on an oversized dark black designer chair, dressed in a black sweatsuit and white sneakers. The scene uses a gradient black background with soft abstract 3D shapes, floating glossy spheres, and refined studio lighting. Large bold white letters reading "LUMINA" are placed behind me, with delicate handwritten "Welcome to" just above. Exclude any additional text, logos, dates, watermarks, or brand marks. The final image should be minimal, upscale, vibrant, and social-media-friendly—featuring sharp details, gentle shadows, photorealistic rendering, and 8K quality.