1
Keep the skull volume, then stylize the contour
A smaller nose and sharper chin do not erase the cranial ball. Start with the same head construction, then carve the silhouette into your chosen style.
Anime guide
How to draw anime faces with perspective that still feels solid
Stylization works better when the underlying volume is correct. Anime faces can simplify the planes, but they still need a coherent center line, cheek rhythm, and chin placement.
2
Simplify features after the head turns
Do not paste symmetrical anime eyes onto a turned head. Rotate the face first, then decide how much to compress or enlarge the visible eye.
3
Use light to describe planes, not realism
Even a clean cel-shaded face benefits from believable plane changes on the forehead, cheek, nose wedge, and jaw. Think clarity, not detail.