Only took nearly two weeks, but I have finally filled in the outline!

As you can probably tell by the herobrine eyes and wireframe ears, I didn't actually fully complete it, since the goal of this was just to teach myself how to create the shapes I wanted, and I'm pretty sure I am capable of doing what remains, it's just a matter of time (mostly procrastination). I learned a lot in the making of this test head, and I think it turned out really well, but I do see room for improvement.

For example, I should have done the lower jaw in the closed position, because now if I close it, it'll look weird. I also think that the head proportions in general are a bit weird, so I may look at some actual models and see if that helps me make these better. Also, I should have made the outline in a thickness that can be halved without needing more than 3 decimal places... 0.025 is not one of those numbers, it turns out. That made some things not line up well, and if I was completing this head I would be in a lot of agony fixing it. Thankfully I'm not :D