Friendly Male Doctor Portrait

photorealistic studio portrait of a friendly middle-aged male doctor with short brown hair, slim build, wearing round eyeglasses, a white lab coat over a light gray button-up shirt, pen and green note in chest pocket, smiling warmly while raising one hand beside his face making an OK gesture, upper-body waist-up framing, centered slightly to the right, clean minimalist light gray background, soft even studio lighting, natural skin tones, subtle shadows, professional medical concept, realistic fabric texture on lab coat, crisp details, 35mm portrait photography, eye-level camera