Construct the posture, and ensure balance

In the first example, the body is well balanced, as the head is tilted as far forward as the back is tilted backward in return. However, I would now like to have another element, which from top-left to bottom-right completes the composition (see example 2 with the orange line). In most cases the placement of hair, for example, is suitable for this. Therefore I don’t just apply the hair from the first sketch, but change it a bit to round off the composition.