Ultra-realistic Instagram Portrait on Grassy Hillside

4K ultra-photorealistic Instagram portrait of a young man sitting casually on a grassy hillside. He has wavy black hair, inviting medium-tan skin, and a relaxed expression looking left. Face, skin tone, hair, and proportions must match the reference exactly reference image. 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 selective focus featuring cinematic colors, unforced textures, tender shadows, and HDR realism. Tip: add a tiny scale reference (a coin, a pencil) to anchor object