A realistic, photorealistic 4K 3D model of an astronaut in a detailed, NASA-inspired space suit. The model features ultra-high definition textures, accurate fabric and metal reflections, and dynamic, natural posing. The helmet shows realistic glass reflections and subtle wear marks. The environment is a softly lit space station interior with ambient lighting and a hint of Earth visible through a large viewport. intricate details, realistic proportions, and a high-poly, studio-quality finish.