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For a beginner, you already have some awareness of body structure--so to me it looks like if you devote some time to hard core anatomy studies, you will have no problem picking it up and progressing. I can tell that because you've included the rib cage protruding, and the muscles of the arm.
Your weakest point is the legs though, I feel like they were just roughly put in there compared to detail you put on the upper half of th ebody.
So, do some more studies because I see you already got the gist of it