Draw a simple upright box for the head
Add two tall antenna-like ear shapes on the sides
Sketch a strong rectangular faceplate in the center
Draw narrow eye slits above the faceplate
Outline a broad chest with a central window-like shape
Add shoulder armor as large rounded rectangles
Draw thick upper arms extending downward from the shoulders
Sketch forearms as sturdy mechanical cylinders or blocks
Add large hands with segmented fingers
Draw a narrow waist beneath the chest
Add a powerful pelvis section with angular armor
Sketch the upper legs as long, thick columns
Add knee armor as layered shapes
Draw the lower legs wider at the bottom for a heroic stance
Add large feet with flat, angular fronts
Include panel lines and mechanical details on the armor
Add the Autobot insignia on the chest or shoulder
Refine the silhouette to match Optimus Prime’s bulky heroic shape
Ink the final lines and erase the sketch marks
Color the body mainly red and blue with silver and gray details
Add yellow accents to the windows and lights