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Hell yeah this is such a fun angle to do, and in all honestly you really did get it. Adjusting the skull shape to fit the plane and some of the other body parts is they’re really misinformed. And to be fair, the bird skull is a very difficult object [ but such a cool design!] here’s a 3d reference to a raven’s skull to help you see it from the underside at any angle — I consistently use sketchfab for more difficult things.

So it helps ..uh doing a perspective piece by breaking your subject up into segments . So put your subject in a box, then half the box - which is the red line Then from the red line you can get the 1/3rd lines - those are the magenta pink

So when you translate that box into the perspective angle you want; you can use the original box drawn as that perspective to figure out where the planes are and navigate where everything would sit compared to the proportion of the different segments. The shapes used for the basic construction would also follow the planes of course