Please give advice and critique

[Maurice]

This is what I did today, poses sketched gesturally and structurally. The last three poses were from my imagination. I'm not sure exactly what's the difference between a structural and gestural sketch. The gestural ones I made seem like rough outlines and the structural ones the same thing, but more blocky and with shapes. Drawing from imagination was tough for the first pose since I wasn't sure how a bent leg would look from that perspective. Is this type of practice in the right direction?