3D Model: Generate A Realistic 3D Model Of A Middle-aged Man Sitting On A Blue Plastic Chair. The Proportions, Body Scale, And Sitting Posture Must Exactly Match The Reference Photo Without Any Changes. Gray Hair, Glasses, Clean Face With No Beard Or Facial Hair. Wearing A Short-sleeved Polo Shirt With A Neon Green Collar And Horizontal Stripes In Green, White, And Blue, With A Pen In The Left Chest Pocket. Black Trousers, Black Leather Shoes. Right Hand Resting On Thigh Holding A Small Yellow Cube, Left Hand Relaxed On The Leg. Exact Body Ratio, Head Size, Arm Length, And Leg Position Must Remain The Same As The Reference Image. High Detail, Realistic Textures, Accurate To The Photo.