Not sure if I’ve asked this, butt in regards to your last picture you uploaded and all of your drawings, how do you know where to line up the head/cranium with the rest of the spine in cases where the head is turned or posed?
well that is simple, the head ideally sits in the middle of the spine…
positioning the head is not the difficult part, in most cases ‘artists’ don’t need to make things ‘look’ right
but make it ‘feel’ right. specially when drawing idealized and/or from imagination altering proportions and poses is rather common ⁽ˢᵘᵖᵉʳʰᵉʳᵒ ᶜᵒᵐᶦᶜ ᵃʳᵗᶦˢᵗˢ ᶠᵒʳ ᵉˣᵃᵐᵖᶫᵉ⁾
the easiest way⁽ᶦᶰ ᵐʸ ᵒᵖᶦᶰᶦᵒᶰ⁾ is to use the shoulders. Most of the time when drawing poses i will actually place the shoulders first and then draw the head. Maybe try ‘gesture drawing’ as exercise.