Draw an oval for the ribcage
Add a smaller oval or circle for the pelvis
Connect ribcage and pelvis with a centerline axis
Sketch shoulder width slightly wider than hip width
Place the waist narrower than both shoulders and hips
Block in the torso shape as a rounded form (ribcage tapering toward the waist)
Indicate the sternum and lower rib area with light guide lines
Add shoulder joints and collarbone line lightly
Draw the neck as a slightly tapered cylinder on the centerline
Mark the breast line using a horizontal guide across the upper torso
Block in breast volume as two rounded masses over the chest ribcage
Define the upper chest and lower abdomen contours with smooth curves
Add hip bones with a slight outward flare at the pelvis
Sketch the inner pelvis curve toward the centerline
Place the leg attachment points at the sides of the pelvis
Draw a simple guideline for the torso twist (slight S-curve if the pose requires)
Add the ribcage-to-waist transition with a gentle taper
Refine the outer silhouette: shoulders to waist to hips
Lightly sketch the back shape to balance the front silhouette
Add the shoulder-to-armpit area curve and the side torso contour
Add the abdomen taper toward the pelvis
Clean up overlapping lines and keep the final silhouette smooth
Add subtle landmarks (waist indentation, hip curve, under-chest curve) lightly
Erase or reduce construction lines once the form reads clearly
Finalize with confident line weight on the outer contour and lighter lines on interior structure