ultra realistic illustration, siena natural ratio, ultra hd, realistic, highly detailed, UHD drawing, perfect composition, ultra hd, 8k, a beautiful teenage student with a ponytail hairstyle, a white fitted-sleeve shirt collar, a black cashmere long cardigan on the shirt, right hand in the waist and the arm folded, a red tartan pleated mini skirt, shiny black long leather boots, beautiful face quality, portrait,full-length