The reason for turning edges after they’ve been divided is so you
can move the new vertices around to match the guideline even
closer. Click the Vertex buttonunder the sub-object menu. Hit
F8 until the axis changes to both X and Y. Then, one by one
click on the new vertices by the bridge of the nose and position
them so the contour of Head matches the profile of Head Guide
better.
When you’re done, the Head object should look something like this:
Now things start moving faster with this technique of “Divide,
Turn, and Tweak” to shape the profile of the face even further.
88PartII/Modeling
Zoom in to the nose and lips ...
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