I modeled a human torso, but the anatomy is a bit off.

I am aware of the line in the middle and the hole in the neck.


It seems to me that you already know the issue. I just did a search for ‘torso’ on google and got great ref in seconds. Study and copy reference and that will teach you how to sculpt the torso. Try and see the bigger simpler shapes and volumes first. If you did have ref, post that and maybe someone can point out where you need guidance.

Then do it again! Or do not do it again! Your choice!
Wait? You did not use sculpting? Use sculpting it is more fun, as you do not have to think about about the structure of your mesh (edge loops etc.)! Have a nice day!