Dudley Henriques writes:

You're right. The best yaw indicator in the airplane is the nose of the
airplane. Instructors should be able to pick up the slightest amount of
uncoordination simply by watching the nose. Its also a good idea to wean the
student off the ball and onto the nose as soon as possible. I'll go so far
as to say that it was my common practice to do this on the first flight.
In my opinion, much too much attention is placed on the ball as a
coordination verification tool, and much too little attention paid to the
nose of the airplane by a great many CFI's.

How can I determine that the turn is uncoordinated by looking at the
way the nose moves?

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