Nice pictures, I don't know too much about life drawing, there pretty good as is. The only thing I would suggest is to clean up the shading a little bit and also show some of her bone structure. An example of that would be like showing the shoulder blades on the drawing of her back. Overall though, nice drawings.
The Model itself is great in my opinion. You were able to get multiple angles yet still keep it looking like the same person. The only question I have is about the first photo. Near or on the belly, it looks like a tattoo? Anyway, great sketches.
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indeed, my attempt at drawing her tattoo.