Retro disco-pop studio portrait of Sadie Sink. She sits on a reversed glossy red chair, legs open, turning her head back at camera with an over-the-shoulder gaze. She wears a high-leg pink spandex bodysuit with white piping, rose-tinted transparent aviator sunglasses, and red patent high heels. Sleek brunette high ponytail. She holds a large multi-faceted metallic silver disco ball. Hard side-lit studio lighting from camera-left creates sharp defined shadows across her body and the background wall. Specular highlights catch the bodysuit and disco ball facets; small square caustic light reflections from the ball scatter across her skin. Solid monochromatic bubblegum pink to hot fuchsia flat wall behind her, minimal background with a sharp drop-off 3D pop shadow. Vertical medium-full frame, subject centered, shallow depth. High contrast, glossy finish, high saturation, clean digital look.