Hi Temper,
to me it looks likes you've got a fairly good understanding of proportions and how the figure is structured out of limbs and joints. Your short-length studies show this really well (30 secs/1min poses). In your longer-length studies it seems you are then trying to build-up the form of the body using many sketchy lines. I don't mean to say this is wrong, but my suggestion would be to try suggesting the form using fewer, more fluid lines.
Perhaps to make the transition between the basic structure (limbs and joints) and building up the form and silhouette of the figure, you could try drawing shapes (triangles, rectangles etc.) around the joints and limbs. This will give you an idea of the form of the body, and as a final step you can then confidently draw strong, fluid lines to suggest the silhouette.
To break this down:
1. Quickly map out the proportions of limbs and joints (you're already doing this really well)
2. Spend a bit longer building up the basic shapes of the body's forms and see how they overlap and relate to each other
3. Once you have your foundational forms built up, you can confidently draw a fluid, gestural line over and around the forms, to suggest a silhouette
To demonstrate what I mean I'll include a link to one of my recent sketches - it's by no means perfect or the 'right' way to do it, I just thought it might help.
Actually, I think you are already doing everything I've suggested in your last sketches, but perhaps you could use a different colour pencil or 'brush' to go over your final linework to make it stand out from your sketch lines.
I hope this helps you somewhat anyhow.
All the best!
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