Very good sense of form and volume of figures, I'd recommend drawing larger (even if they overlap older drawings) and focusing more on proportion, most of these sketches would benefit from closer attention being paid to limbs closer to the viewer being larger than limbs further (sketches 3 and 4 are good examples of the limbs that are closer appearing smaller than those further away). More attention being paid to contour lines and line heirarchy will also greatly benefit future sketches
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