What helped me at the beginning was to try to do these in quick, clean lines and really force myself to think WHY i was placing a line. What I mean was, instead of drawing the circle and keep on circling the pencil around and around it, or doing these scratchy lines, was to really aim to get the right line and the right circle with ONE or 2 clean strokes. It was hard at first, and it forces you to really think about each line before you put it on the page. Hope it helps! :D

Nothing to do about the circles but just keep practicing! I would practice that a little bigger though - learn to work with your elbow and shoulder rather than fingers and wrist. I'll also note that the structure of the neck begins further back (see second image) and that on a lot of your 3/4ish view there's not a clear plane change. See on first image the one I circled, where the marked angle indicates a plane change, and how the other marked sketch shows the same idea applied. You may want to check out drawabox.com and work through some of their fundamentals lessons (all free!) before coming back to these heads, once you are more confident constructing a 3D shape I think you'll see a ton of improvement in this exercise!

The struggle is real :0 I'm not so successful at heads myself, but I did notice they got a bit easier as I studied more 3D forms, namely cylinders. Perhaps you should draw a cylinder, draw a line dividing it in half, then practice spinning it at any angle and keeping the line proportionate? I dunno...actually, I oughta try that myself, I never even tried my own suggestion!? One thing I actually DID practice is drawing squares at all angles and practice putting a perfect circle that fits inside it. Using the squares as a guide helps me draw circles in perspective, which translates well with head drawing