Act as a professional sci-fi concept artist with expertise in retro-futurism. Create a detailed image of a [RETRO-STYLE] astronaut planting a [FLAG_DESIGN] on an alien planet. The scene should feature a [COLOR_PALETTE] sky filled with [CUSTOM_STARS] and distant [ALIEN_LANDMARKS]. The astronaut's suit should be inspired by 1960s space exploration aesthetics, with bulky, metallic textures and a reflective visor. The alien planet's surface should have [TERRAIN_TYPE], such as jagged rocks, glowing flora, or sandy dunes. Add subtle details like [ATMOSPHERIC_EFFECTS], such as a faint haze or glowing particles, to enhance the otherworldly feel. Ensure the lighting evokes a sense of isolation and wonder, with dramatic shadows and a soft, golden glow from a distant star.