i checked your art advice tag but i haven't seen any tutorial on backs (slightly seeing the face?) can you please help once again? thank you very much for helping :))
Honestly I’m still learning how to draw the back myself. We only learned back muscle anatomy in the last few weeks of life drawing, and it’s confusing AS HECK. You obviously don’t need to draw all the muscle groups, depending on the buff-ness of your character. Below is a diagram I drew during class. It’s not super clear so I would highly encourage studying other references.
Here’s a more simplified version, with the face slightly showing, like you asked:
Remember to shape everything out first before adding detail!!