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I really like your overall understanding of the general shape of the body. You seem to have a good grasp of shapes and that can definitely help you understanding the dynamics and proportions of the human form(s) - as I can see is indeed your current goal! One issue though with your study is the shadows. They look a bit rough and make the reading of the pose more difficult than not as they don't incorporate with the rest, they seem added on and like they are not meant to be there in the first place. You got the perspective right though, and that's definitely a positive, as that can help you later on to understand proportions and have a better grasp/apprehension of anatomy in general. Keep it up, you're doing great!! this looks promising. I don't know how much time you had for this exact pose but if this was a 30 minute pose, make sure you focus on some details to have a good final render next time x