A high-quality anime illustration featuring a cute young girl riding a small Mongolian horse across a vast, sunny plain in a full body shot from a side profile view. The girl, appearing to be in her early teens with a cheerful and joyful expression, has sparkling eyes and a wide smile as she gallops forward. She is dressed in traditional Genghis Khan-era Mongolian attire, consisting of a layered deel with intricate traditional patterns, a fur-trimmed hat, and sturdy leather boots, with her small hands firmly gripping the leather reins. She is mounted on a sturdy, small-statured Mongolian horse with a glossy brown coat, captured in mid-gallop with its mane and tail fluttering in the wind. The background is an expansive, vibrant green grassland stretching toward a distant horizon under a clear, bright blue sky with a few fluffy white clouds. The lighting is bright and natural, emphasizing the vivid colors of the landscape and the joyful atmosphere of the scene, rendered in a clean, polished anime art style with sharp line work and soft shading.