The axes belonging to the foot
Display Figure 16.
Figure 16 shows the red and blue axes belonging to the foot. (The green axis isn't visible.)
The airplane rule tells us that the green axis extends through the calf of the leg toward the knee.
If we cause the nose of the airplane to pitch downward, that will cause the toes to point away from the skater. That is the motion that we want.
Figure 16. Red and blue axes for the foot exposed.