I understand where you are coming from with this, however you really should not limit yourself to never using any references, the only way you will learn the basic outlines and shapes for the head in different perspectives is to see it for yourself.
I'm sort of aiming eventually for the same goal as you, although I'll admit you're stuff looks a lot better then most of my things.
I can understand how frustrating it must feel having characters and concepts and ideas in your head and feeling unequipped to put them to paper, however really, you should give yourself credit where it is due, those sketches are really nice, assuming you are going for a more stylized anime look.
The mouths in both images look slightly pointed, which is probably what Tor1god was talking about.
The eyelashes on the second image appear to be too dense, and from an angle such as that each individual lash would probably be a little thinner, and following in the same direction.
I'd really have to suggest using references-at least early on-to get an idea on how the shape of each part of the face differs in alternate perspectives.
Really however, you should not feel so negative about these sketches, they look great, and you can only improve.