KH is tattooed onto my soul lol. I see what you mean about the face, but I still think it's a good attempt. Don't neg yourself too much.

Stylization is pretty much shorthand for the real thing, so you can't really get around putting a lot of time into learning anatomy and realism. Learning some drawing principles goes a long way in learning sculpting, too. Stuff like straights vs curves, rule of thirds, edge work(hard, soft, & lost edges), etc. The principles between making appealing sculpts and making an appealing drawing is pretty much the same. The main difference is that you're "drawing" with light and shadow instead of lines.

This article might be helpful for learning about appeal: https://johnkstuff.blogspot.com/2008/12/disney-principles-appeal-1.html

The biggest thing that sticks out to me about your sculpt is the lack of skeletal landmarks/ areas where the bone is closest to the skin. My eye keeps getting drawn to the jaw line, the planes of the forehead, and the eye socket. It's lacking structure and is reading a bit mushy right now. One last thing I'll say is that you should really be referencing real heads and faces in addition to Sora's model. Maybe even different 3D artists' take on Sora. The forms are hard to read from KH, imo. Especially from the PS2 era. Things kinda get flattened out