Sunny Park Portrait in White Dress

Create a photorealistic vertical portrait of {argument name="character name" default="a young East Asian woman"} sitting on lush green grass in a sunny park, leaning beside the thick trunk of a large tree on the right side of the frame. She has {argument name="hair color" default="long straight black hair"}, fair skin, delicate natural makeup, and a calm slight smile while looking directly at the camera over her shoulder. She wears {argument name="dress style" default="a flowing white halter sundress with an open back and thin tie straps"}; the translucent layered skirt spreads softly across the grass. Her body is seated in profile facing left, knees bent, hands resting near her lap while holding {argument name="handheld object" default="a black smartphone"}. The background is a bright green park with exactly 3 visible small tree trunks in the distance, dense leafy shrubs, dappled sunlight, and deep natural shadows under the canopy. Use realistic smartphone photography aesthetics, natural summer daylight, high detail in grass and bark texture, soft skin tones, gentle backlighting from the upper left, shallow-to-medium depth of field, candid elegant composition, vertical 4:5 aspect ratio. Avoid text, watermark, extra people, exaggerated glamour styling, or artificial studio lighting.