Weekly practice, trying to figure out the "loomis head"

I will start this by saying I am in no way a professional and half of my drawings seem to ignore the Loomis method entirely. However compared to your previous work this seems to be a marked improvement. From my own studies I have found that boxes do not make heads, so swapping to circles and the loomis method seems like a far better way to go. 

https://rapidfireart.com/2022/09/30/how-to-draw-a-face-from-the-front-loomis-method/

These guys have some amazing breakdowns of the loomis method that helped when I looked into it. With various angles and breakdowns for both male and females. 

Another method I find that may help is tracing, especially if you are using pencil and paper rather than digital art. Find art that you like, get some tracing paper and copy the work, then break it down into the loomis method or other methods, see where they align, see where they differ.

Regardless keep up the solid work.

Hi glhm, 
I love how much you practice and how brave you are putting your work out here for critiques,
Idk what you are using to learn the loomis method. I like ProkoTV Loomis Youtube vids.
To learn this I would not set a time limit at all. I would also not draw any specific facial expressions. Just go with a neutral face. Once you have that down you can get more creative with it. Once you have the facial features in the right place, the next thing to focus on is how to draw the facial features. It looks like you enjoy practicing a lot of different things. I would focus on 1 specific thing (loomis head and proportions). Once you are happy with those results move on to the next thing (proper drawing of eyes, nose, mouth, etc.).
Keep practicing. Your persistence will get you there. Good luck!