After reviewing the result of the first attempt to animate the face, I went back to the drawing board and thought carefully how else I could approach this...
Previously I used the 'FFD' modifier to simulate eye expressions and movement and decided to try this method out for the facial expressions..
As useful as this tool can be, for the purpose of its task here the vertices were being overstretched and is not the effect I wish to display when animating my character. So unfortunately, the FFD tool is not suitable!
My next idea would be to try using the 'Morpher' tool. This is a simple animating tool which allows different vertice position to be copied by a 'parent' object from it's 'child' clones. In other words.. each clone of the original object will be a different shape and the original object can 'transform' itself to appear the same as a selected clone.
I began by experimenting with simple 2d images using planes and editable polygons to represent different facial expressions. The object on the far left is the base (with no modifier applied) and the object directly next to this on the right is the base object with the 'Morpher' modifer applied. Currently, this object has a mixture of expressions applied to it and can be altered using a percentage setting to define how much of each expression is applied via the morpher.
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