An adult marine acoustics researcher in her forties stands in a quiet coastal monitoring lab, wearing a navy utility shirt and lightweight field vest while holding a compact hydrophone sensor naturally at chest height. Create a vertical waist-up environmental portrait with an 85mm lens, placing her slightly off center. Layer acoustic foam panels, cable reels, unbranded scientific instruments and a gray ocean horizon softly in the background. Use diffused overcast window light with a narrow warm practical-lamp edge, refined documentary photography, realistic skin texture and subtle film color in slate blue, sea green and warm skin tones. Calm direct gaze, correct hands and sensor geometry, no readable labels, no logos, no trademarked equipment, no lab-coat cliché, no glamour retouching, no watermark.