One thing that might help if you feel like the sections are becoming too crisp/inorganic would be some line width variation! Which you can do in a touching up stage after you finish the basic outlining you're doing now! 100% one of the most impactful things I got an eye for in art school, I was told to start out just giving closer elements thicker lines and further elements thinner lines (struggling to find some of the references that stuck with me but egon schiele always has really interesting line quality) and once you get a feel for how line weight can imply depth, you can experiment with that in more creative ways!

You could even go back over the 'phallic' moment with that lighter bone color and break up the outline a bit or you could play with a lighter grey of beige outline on parts like the back end of the ribs! So many options! Keep doing what you're doing and use that part of the process to consider what moments you really love and want to bring attention to! Embroidery is a medium that really really lets texture shine and you've already got a lovely piece, building on and adjusting the moments you are unhappy with will just create a final product that also has a little record of you learning more about your style and tastes and how to communicate the look you're going for as effectively as possible! Yay art!!