I don't use a ton of guidelines myself either, I often find them distracting. If you've try using them and they don't work for you? That's totally fine.
I think one way you can improve is giving your drawings enough space - Like, I can tell some of your observations are quite good, but then you run out of space bc of a different drawing, or the edge of the page, and it sorta forces you to warp your lines.
Another thing I think could really help you is pencil weight, right now all your lines are pretty much equally heavy, which makes it difficult to communicate volume. For example, you now have these very clear outlines around the lips, but if you colour them with a lighter grey, they will look less rigid and permanent. It'll be easier to slightly correct them, AND it'll be easier to get stuff in the right locations based on them.
Hope those are maybe useful to you!
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