/ic/ - Artwork/Critique

I've asked this in /sqt/ but maybe I'll get some help here:

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Help me out, anons. I keep having a rough time placing things on a face without ref. Look...

> draw circle
> eyes along some horizontal line

Now I start having problems.

> how far away are the eyebrows from the eyes?
> if I split the face in thirds, I get hairline/brows/nose/chin, but how am I supposed to split in thirds if I don't have the full face height yet?
> I've done full video courses for both Huston and Vilppu ... it looks like they magically guess the height of the face then divide it in thirds. How?

With ref I can kinda figure it out after a few iterations, but I only realize something's wrong without ref once I'm in too deep.

This is so hard. Pic related.

tl;dr: I cannot construct the position of the chin without guessing.