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Nice! This captures great volume and texture. Something that could help add more realism is thinking about the light source in the reference and drawing. I notice some hairstyles, especially in the bottom row, with more evenly distributed highlights throughout all the hair sections. Pinpointing the specific direction the light is coming from and how softly/harshly it distributes across the hair as a whole can make the hair more believable, as if it were actually affected by a real life environment. After capturing the general distribution of light & shadow, you can start adding the smaller hair section divisions to really make it pop. You have great work so far -- keep up the good practice! :)

Great practice! You have a good understanding of gesture. I can tell you are thinking about the pull of gravity on the breasts in these drawings. Moving forward, I think you can incorporate the pull of the arm position to emphasize the weight even more. Using the egg shape of the ribcage as an anchor point, try to feel the pull upwards of an overhead arm against the pull downwards of gravity. When the model has her shoulder blades pinched together, think about how the chest opens up and the breasts are pulled past the 45 degree angle at resting position.