Woman at doorway to a curved cylindrical fantasy world

A surreal digital artwork captured from inside a modern room, looking through an open white doorway where a smiling young woman with wavy brown hair, wearing a white polka-dot headband, a yellow and brown horizontally striped collared shirt, and baggy dark trousers, stands on the threshold looking back over her shoulder. The doorway reveals a mind-bending, vast, and luminous landscape structured like an O'Neill cylinder or an Inception-style curved world, where rolling green hills, scattered houses, and winding dirt paths stretch forward and seamlessly curve upward into the sky. Directly overhead, an inverted, mirrored terrain of dense green forests and soft clouds arches gracefully, creating a breathtaking, tubular perspective of a self-contained world bathed in warm, ethereal sunlight, blending hyper-realistic character details with an architectural, dreamlike fantasy environment.