I'm not a expert in anatomy, but the bit I learnt may help you.
Your example show a large pelvis, so I assume that you try drew a woman (they have large pelvis because there is stored the baby), you actually doesn't need draw a circle, you can use a triangle, the top of pelvis is rounded, but the strutured is similar to a pyramid and move it in the same direction that you point your ribcage. What I recomend to you is keep see anatomy at general, but study some parts more deep to understand better.
After that you can give more shape to figure like I did, just forget the arms and legs, I'm still not good enough in draw they, too.