You want to think about which way the object is angled relative to where you (the camera) are looking from. You are looking from roughly the middle of this figure. The hips are angled forward, and you are looking down at them, therefore you can see their top plane. The torso is tilted back and you are looking basically up at them, therefore you can see the bottom plane. If you were positioned above the model, the hips would be tilted towards you and you would still see the top plane. But, now positioned above the model, you cannot see the bottom plane of the torso. However, whether or not you can see the top plane is dependent on how far the torso is leaning away from you. You might be able to see all, some, or none of it depending on how far back it is tilted.