Ultra Realistic Instagram Portraits with Horses

4K ultra-realistic Instagram portrait of a man walking slowly on a grassy hillside beside a white horse. Face, skin tone, hair, and proportions must match the reference exactly. He has warm medium-tan skin, relaxed expression looking forward. Outfit: light grey knitted sweatshirt, loose brown trousers, slightly worn light sneakers, and a silver rolex watch. Natural walking motion, holding the horse loosely. Background: misty green hills, scattered trees, soft overcast light, shallow depth of field, cinematic colors, natural textures, soft shadows, HDR realism.