So for future referanve how msny frams did you use
30 frames for the best turning smoothness
What you do is you make a animation with your head moving from as far left, to as far right.
Lets pretend this line below is the animation, 30 frames long.
===+---------+---------+---------+
===L M R
The L is the head all the way turned left, the start of the
headside animation.
M is when it's looking STRAIGHT forward
R is when it's looking to the right at it's final frame.
Keep in mind you can have other animations before all this, represented with the = sign.