it seems one of the main issues you seem to be undergoing at the moment is the relationship between what you see and what you then draw on the page- you'll note from the reference loomis heads you drew for plane-studies that they don't look much like the references. Now is a very fine time to put a brake on things and ask yourself why that would be. It certainly won't do you any good to study from refs if the work isnt coming out right- so go grab something for your desk (a sharpener,a can,fruit etc) and just pencil draw it,focusing mainly on the shape. Try closing one eye and really trying to capture an accurate representation of what you're drawing because at the moment if you overlayed any of the above to the reference there are a lot of things out of place.
Be determined and practice a lot and you'll go far
Never Attempt the Possible;attempt the impossible and even if you fail,you'll fall among the stars.