Hands and feet

The gesture on the red underdrawing without blue ink is strong and highly descriptive as a drawing in its own right. From what i can see this is true of the drawing on the far left as well, it's hard to tell with the others. I would say that when switching to the blue ink, which might for you represent some sort of finality/fatality of the drawing, the studies stiffen up because the lines become shorter, overlapping, and somewhat uncertain. This tightens up the drawings. Maybe ink is a problem here because it is immovable, or maybe it's working in two layers - which might convince you to worry more over the second.

Also, you can maybe think of it like this - quick, energetic things are light; birds have hollow bones so that they can fly and fly quickly. More lines add visual weight, this is both an observation on value and optical density. Specifically, I am talking about the contour of the hand, not the hatching for value. It might help to seperate your practice into smaller parts; try doing some sessions where you focus specifically in drawing the outline of the hand quickly and confidently (if the proportions distort a bit it is okay,), then try doing other sessions where you focus on building values on the hand.

Good work!