(masterpiece, best quality, ultra-detailed, photorealistic, highres), beautiful 18-year-old Caucasian girl with a flawless youthful face, large bright blue eyes, soft features, small pointed nose, full glossy pink lips, smooth fair skin, long straight natural blonde hair parted in the middle, standing with arms lifted behind her head, very large and heavy natural breasts fully exposed from underneath, nipples carefully hidden by her ultra-short tight pink crop top, long-sleeved and made of matte stretch fabric ending just below her bust, flat toned stomach, small tight white ribbed knit cotton shorts, high-waisted and very short, tightly hugging her hips and outlining her crotch, wide hips and slender toned thighs, perfect hourglass shape, posing casually on a rustic white painted wooden balcony with decorative cutout railing, behind her is a vibrant golden-yellow autumn forest, thick tree trunk and branches visible, bright warm sunlight from the right casting realistic soft shadows, high realism, true-to-life texture and fabric detail