Nice sketches,
I think the lines for the limbs work well and feel well anchored to the body. I'd give a suggestion to draw a second line of action at the beginning of the sketch that shows how the model is standing in space, like a line of best fit from the feet to the head or arms. I find this really helps in lining up the drawing so they're balanced, and don't feel like they might tip over.
A lot of the (great) reference photos are from stills so the model would have to balance themselves for a bit of time to make the poses too.
All the best
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