old woman

(award-winning, hyper-realistic, 8K, ultra-detailed, masterpiece),
stunning 18-year-old woman, white flowing hair like silk in motion, performing a small jump on her mountain bike over a forest stream,
back view, standing on pedals, ??? lifted, ??? arched high, tight translucent white leggings wedged between her large round ???ocks,
hourglass figure, ???, slim waist, mountain forest background with waterfall mist,
sharp crisp detail, sunlight sparkling on water, photorealistic textures, dynamic action composition