Retro Futuristic Space Colony

the prompt

Create a retro-futuristic illustration in the style of 1970s NASA space colony concept art. Show a family of three—a man, a woman in a yellow dress, and a young boy—standing on a viewing deck, looking out of large circular windows. Through the left window, depict the dark void of space with a bright sun and a distant planet. Through the main, large window, reveal the interior of a massive O'Neill cylinder, featuring a curving landscape of green hills, a blue lake, scattered trees, and futuristic white architecture. Use a warm, optimistic color palette with soft lighting and the textured, painted quality of a vintage sci-fi matte painting.