Mark 6 is the knee line. If you want to draw a figure containing 10 or more heads, the knee line will shift to mark 6.5. The knee joint is the largest in the body.
Connect the given parameters with lines.
Mark 8 is the ankle joint line. Draw little circles denoting the joints.
Connect the hips, knees and feet with arcuate lines. From the hip to the knee, the leg narrows, the expansion of the lower leg goes to mark 6.5 if you are drawing on 9 heads, or mark 7 if you are drawing on 10 heads.
The feet occupy segment 8–9 or 9–10, etc. The feet can be slightly elongated.
To draw the chest, draw the conditional shoulder joints inside the chest, which you divide with vertical lines directed to the waist. From these new lines, just above mark 2, add serifs – these will be the armpits. From the armpits, draw the breast.
Next, draw the arms. Knowing the main arm parameters (segment 3 is the elbow crease, segment 3–4 is the forearm, 2⁄3 of segment 4–5 is the hand), draw their contour.