Since I've been using Zbrush for modeling and texturing and Maya for everything else i decided to deform my character's face using Zbrush by simply exporting my Dragon's face in OBJ. format and importing it to Zbrush.
There i basically used 2 brushes, the Standard and the Move Brush to get to the different expressions ive needed, in Zbrush i can easily and very quickly make various expressions in my character in a form of Subtools (Layer-Looking space on the right side of Zbrush), when i had every expression i think i will need, i simply press "Export" on the tool palette and it will export every subtool separately as OBJ files.
There we go! as you can see, you can create different shapes for your character without the need to start pushing and pulling vertices, which would take you hours, instead of minutes. Now, to apply the blend shapes to your character you need to select all the different head models (or the model you modified) and lastly select the MAIN HEAD, in my case is the one on the far left, and go to Create Deformers > Blend Shape.
That's it! you have your blend shapes applied to your character...but wait, where do i see them?, go to your attribute editor and on inputs you will see them or you could head to Window > Animation Editors > Blend Shape. IT LIVESSSS!!! Adjust the values and see it come to life.
Well that's a quick look at how blend shapes work, pretty easy i would say. Now you know as much as me about blend shapes, Congratulations! ill keep exploring this tool, hope you will too.
Want to know more about blend shapes, here are some links i thought would be nice to look at.
http://en.wikipedia.org/wiki/Morph_target_animation
http://www.youtube.com/watch?v=JEcDocw2n-Y
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