Step 15: Darken the shapes on the right side of the body to create the first part of the arm. Darken the shape for Cyborg's shoulder but angle the lower, left corner inward a bit. Curve the right side of the shoulder more and darken the lines for the arm under it. Darken the big, rectangular shape at the bottom for the forearm. As you darken the shape, curve the top, right corner inward.
Step 16: Add a small, pentagonal shape inside the shoulder for a bolt. Draw a smaller shape inside the bolt for extra detail. Add another small shape on the shoulder for another bolt. Draw a couple of curved lines near the left edge of the forearm for a design element. Add a horizontal line across the forearm for more detail. Draw the shape of the fist inside the small, curved line on the left side of the forearm. Draw a couple of short, curved lines at the top for the folded fingers. Use shorter lines on the left side for Cyborg's knuckles.
Step 17: Use the big, rectangular shape under the head as a guide to draw this Teen Titans Go character's chest. Darken the sides of the shape except for the bottom. Don't overlap the arm on the right side. In the middle of the chest, draw a big, square-like shape. Make the top part wider than the bottom. Add a couple of lines that slope up toward the shape for the bottom edge of the chest. Draw a couple more sloping lines near the top of the chest for more detail.
Step 18: Darken the shape under Cyborg's chest for the torso. Inside, at the bottom, draw an angled line for detail. On top of the angled line, draw three vertical lines for more detail.
Step 19: Use the shapes on the left side of the body as guides to draw the other arm the same way as the first arm. Darken the top shape but angle the bottom, right corner up a bit. Draw a couple of small, pentagonal shapes on the shoulder for bolts. Darken the lines under the shoulder for the arm and the bigger shape at the bottom for the forearm. Curve the top corner down a bit and add a few lines inside the shape for design elements. Most of Cyborg's hand will be behind the torso, so only draw the visible portion.