practice with face anatomy/proportions?

basically title but i really struggle with proportions and sometimes angles. i know to practice and i have been and it helped for a bit but i feel like ive plateaued. my friend said studying skulls helped him. i have ideas but i was wondering if there a specific method you guys used that helped improve? should i invest more time in the loomis method? ik theres a term for this but i cant remember it- i generally go for like slightly more animated than people would call realism.