/ic/ - Artwork/Critique

I'm trying to git gud at drawing heads at any angle. When i do my first stuff, i've tried to draw human heads and stylized it but everything looked off, but now i think im starting to get it.
Insightful observations of good artists work get me idea how to change proportions and perspective of face. I kinda invent it by myself with loomis guidelines.
Anime heads are not equal to real one. I've seen many bad tutorials about that, so what would be great for me is some kind of golden rules that can be used as a base. Just like loomis for realistic heads.
Any book/video curses recomendations about manga heads and faces?

animu doodles