Create an ultra-realistic 8K portrait of a smiling Indian man celebrating Diwali. He is wearing traditional festive Diwali attire—a richly embroidered red and gold sherwani with a matching dupatta. His face is well-lit and expressive, with warm lighting that highlights his joyful mood. The background features glowing Diwali decorations: colorful rangoli patterns on the floor, sparkling fairy lights, and vibrant fireworks bursting in the night sky. Include traditional Diwali elements like lit diyas (oil lamps), decorative lanterns, and firecrackers. The composition should resemble a professional DSLR camera shot with shallow depth of field, cinematic lighting, and crisp detail. The text “Happy Diwali” appears in glowing red and gold lettering above or beside him, styled like a festive banner. The overall mood is celebratory, warm, and full of light.