Lightly sketch the chain path with a curved centerline
Draw the first oval or rounded rectangle link
Add a second link overlapping the first at an angle
Continue alternating the angle of each new link
Keep each link evenly sized
Make the overlaps consistent to show interlocking
Add thickness to each link by drawing inner edges
Refine the outer contours for smoothness
Erase hidden lines where links pass behind others
Repeat the link pattern until the chain is complete
Add shading to one side of each link
Darken the overlapping areas for depth
Clean up the sketch with final linework