Face identity locked exactly as the reference image, do not change facial structure, eyes, eyebrows, nose, lips, skin tone, face shape, or natural expression. Cinematic ultra-realistic 8K portrait of a young woman taking a mirror selfie indoors. She wears a cute pink top with multiple red heart patterns and light yellow denim jeans. Her hair is tied in a messy bun with a few soft strands framing her face. Soft natural lighting, clean minimal background, warm skin tones, subtle makeup, gentle smile, crisp mirror reflection, high-detail fabric texture, photorealistic atmosphere. Add "SyntheSarah" as a small watermark at the bottom-left corner, Petit Formal Script font, thin elegant cursive strokes, soft white color rgba(FFFFFF), 1px letter-spacing, subtle premium handwritten signature style, slight transparency, minimal and refined, no background on text, blends naturally into the image.