Ultra-realistic Instagram Portrait on Grassy Hillside

4K ultra-realistic Instagram portrait of a young man sitting casually on a grassy hillside. Face, skin tone, hair, and proportions must match the reference exactly reference image. He has wavy black hair, warm medium-tan skin, and a relaxed expression looking left. Outfit: light grey knitted sweatshirt, loose brown trousers, slightly worn light sneakers, and a silver rectangular digital watch. He sits with one knee raised, leaning back naturally. Background: misty green hills, scattered trees, soft overcast light, shallow depth of field with cinematic colors, natural textures, soft shadows, and HDR realism.