Space Sentinel

A determined, Caucasian astronaut, is the central focus. He wears a vibrant red spacesuit with white patches and metallic accents. The helmet framed with a red trim, features a golden reflective visor obscuring the eyes, giving him a focused, determined gaze. The astronaut firmly grips a long, black rifle with a scope, suggesting action, and aiming towards the right. His stance indicates readiness and alertness. The background is a solid, bright green. The overall lighting seems flat, with no harsh shadows, giving a retro, illustrative feel, similar to science fiction book cover art from the mid-20th century. The artwork evokes a vintage, pulp sci-fi aesthetic with realistic tones . The style is reminiscent of classic space exploration illustrations. in 4 k resolution