Not too bad
It was a fairly smooth animation, the graphics were very lacking..but I can't blame you as it seemed like more of a test. I suggest turning the framerate up for smoother animation, putting the head in a different layer that way you do not have to redraw it over and over and over. It also looks smoother. Also using the line tool is much more efficient, zoom in to about 200% and draw with the 3rd brush side, (much smooth results).
~The Good~
Fairly Smooth animation
Good Concept
~Things to Improve Upon~
The art suggestions I listed above
Drawing a background would look nicer.
*TnoaT