I think you’re progressing nicely. Your sense of overlap has been fairly strong from the beginning, and therefore an understanding of depth follows.
I think though one of the things that stands out in many of the drawings is that that they feel somewhat static. One of the things I can tell is that it seems that there aren’t many lines which show exploration across the model (that departs away from the silhouette) and the ones that do seem to be done as secondary thoughts. What has helped me is forcing myself to get away from the edge and following the contour across the figure, going back and forth from edge to interior space and back again.
Michael Matessi has a couple of books on Amazon which helped in this regard (moreso than the figure drawing class I took, though it too was a boost). Of all the drawing and reference books I’ve picked up over the years, those two have been the ones I keep going back to over and over again. The techniques add ‘life’, and I pick up something new each time re-visit them.