Ultra realistic cinematic playful portrait of a young couple

Keep the exact facial features and identities of both people from the attached photo - features only; the reference's lighting is discarded. A vertical 4:5 photograph: the couple seated on a bare charcoal-grey studio floor, side by side and cross-legged with a small gap between them, turned slightly toward each other she caught in an open unguarded laugh, he laughing more quietly with his eyes up - both looking at a hand-drawn chalk-line doodle layer around them: a simple white stick figure standing behind and above them, holding a big drawn heart-shaped umbrella over the two of them, little chalk rain dashes bouncing off the umbrella. The drawn layer floats graphic and flat and never occludes their faces or bodies. Her hands rest on her knees; his hands sit loose in his lap. Wardrobe: her rust-orange cotton overshirt, his mustard waffle-knit henley - real weaves visible. One soft umbrella key from high front, slightly camera-right: it lights their foreheads, noses and cheekbones from above-front, soft shadows falling under their chins and to each face's lower-left, a neutral-warm cast on both skin tones with gentle floor bounce filling from below, one soft round catchlight high in each eye - both faces in identical light, exposed honestly to a single softbox. Each head sized naturally against its shoulders - both in true natural proportion, exactly as a real camera would capture them. True skin texture - pores, his stubble, a natural sheen. Ultra-realistic, 8K-level detail, a true photograph with fine natural grain; the chalk doodle is the only drawn element and the image must still read as a photograph, never an illustration or a render. Color story: chalk white on charcoal with rust and mustard. Insert discreet watermark in the lower right corner of the image, vertical text (rotated 90°), written "aipromptlabs.online", Calibri Light font, white color with low opacity (semi-transparent), medium size. Extreme sharpness on the face, fabric texture and typography of the letters. Shot on Canon EOS R5, 50mm f/2.8, studio light.