3D Model: Generate A Realistic 3D Model Of A Middle-aged Man Sitting On A Blue Plastic Chair, Exactly As Shown In The Reference Photo. He Has Gray Hair, Wears Glasses, And Has A Completely Clean Face With No Beard, No Mustache, No Stubble, And No Facial Hair. His Body Is Slim, Lean, And Not Bulky. He Has Narrower Shoulders, Thinner Arms And Legs, And A Slightly Smaller Frame, More Delicate And Not Rugged. His Expression Is Relaxed With A Slight Smile. He Is Wearing A Short-sleeved Polo Shirt With A Neon Green Collar And Horizontal Stripes In Green, White, And Blue. A Pen Is In The Left Chest Pocket Of His Shirt. He Is Wearing Black Trousers And Black Leather Shoes. His Right Hand Rests On His Thigh, Holding A Small Yellow Cube. The Sitting Posture Must Exactly Match The Reference Photo, With Both Legs Naturally Down. High Detail, Realistic Proportions, Slim Build, Accurate To The Photo.