Swap 'leans in affectionately near her cheek' for something like 'sticks his tongue out while she laughs' and change 'warm, authentic candid moment' to 'goofy, spontaneous candid moment.' Keep the lighting and framing language as is since that's what keeps the shot looking like a real phone photo rather than staged comedy.

Move 'holds a smartphone with a triple-lens camera' earlier in the sentence and add detail like 'phone visible in sharp focus in the foreground, reflecting the camera flash.' You'd also want to loosen 'shallow depth of field' to something like 'moderate depth of field' so the phone doesn't blur out along with the background.

Keep 'candid medium close-up iPhone mirror selfie,' 'soft, even lighting highlighting natural skin texture,' and 'centered framing' fixed since those three phrases are the backbone of the style. Then just cycle the wardrobe line, swapping 'burgundy fitted turtleneck' and 'cream-colored linen shirt' for other color pairs like 'olive green sweater' and 'charcoal grey henley,' and change 'neutral indoor wall, beige background' to something like 'exposed brick apartment wall' for variety.