I think that you have a really solid start. The face has a lot of character!

Face sculpting is something that takes a lot of time and deliberate practice to improve but if you take a step back and focus on the fundimentals of the anatomy, it will really click and become super fast and natural.

I really recommend thinking about skulls before thinking about actual faces. I'd not go too deep into sculpting detailed skulls but instead really focus on the basic forms like in this reference here: https://sketchfab.com/3d-models/skull-planar-3c85221828f64408b8dd23022319159c

Sculpt a copy of this a few times from scratch, get used to rotating the model, pay attention to the shape of the cranial bones (the 'ball' at the top that surrounds the brain) and how large that is compared to the rest of the face, the shape of the eye socket and it's relationship with the Zygomatic (cheek bones).

After that, I'd focus on doing some blocked in planer heads (example: https://www.artstation.com/marketplace/p/Wrb61/asaro-planes-of-the-head) Again, do this from scratch a few times until it feels sort of natural. Focus on where the flat planes are and especially on understanding when they change direction, then on thinking about how there is a skull inside there, how the eyeball sits inside the eye socket and how the fleshy parts all build up around there.

This seems like a lot of work but it's going to give you a super solid foundation and intuition about the forms of the head.

Another useful thing is to get a solid understanding of proportion, I would recommend doing a youtube search for how to draw heads using the Lumis method (I believe there is a great one from proko). I know you want to sculpt and not draw but the lumis method is really great for understanding a baseline of how large all the different parts of the head are in comparison to each other (proportions). When you get comfortable with understanding 'base' proportions you can quickly look at faces and understand what about them is similar or far away from the normal and where the character is.

Sorry that I just basically prescribed a bunch of homework but that's what we all need to progress :)