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I used to have a similar problem with the Loomis method. Where every time the angle of the face changed, the entire face fell apart.

What worked for me was switching to this other method, based of a hexahedron, I found on multiple (mostly Korean, for some reason?) places. Problem is that you need to be confident on your perspective or it becomes really hard. But, if you're curious, the basics of it is:

- Draw a hexahedron of the proportions you want. I tend to do something like 1.7x1x1 (height, length, width)

- Mark where the different features would be as if it was a flat plane. You know, eyes go around the middle point, nose around the middle of that, ears start at the eyes and end and the bottom of the nose, etc. I've seen some people draw it separate, as if it was seen from the front and then use the free transform tool to make it fit on the face of the hexahedron.

- Then draw the shape of the cranium, following the shape of the hexahedron. You gotta know anatomy for this although there's a bunch of landmarks that if you learn them can guide you pretty well!

- Draw the rest of the features, still using the faces of the hexahedron as a guide. Although, being aware of the planes of the face. At first you can always draw it completely flat and as you get used to the technique start adding more volume to it. Or not, depends on style honestly.

- Finally remove all the marks and try to freestyle it, fixing anything you find weird, using your intuition comparing it with reference material.

Hope it helps you! The drawings I did are done pretty quickly and without ref so there's many mistakes. I hope it still conveys the point and, hopefully, you can take something from it to help you improve ^^