Turnaround Test. It can be smoother if I draw 4 more frames, but it will be a pain in the ass. If the character is symmetrical, you can cheat; basically, you need to draw 4 and then mirror it. However, if the character is asymmetrical, well, you need to draw 8, or you can mirror them and adjust or add some additional.
For body volume, I focus on body silhouete not realism, as you can see in the earlier post, the most left one, the curved silhouette isn't there. Secondly, I tried to explore the topology and explore the muscle in deformation.