Resizing Headshapes?

[javierrr13]

I was wondering if there was a simpler way to make headshapes bigger or smaller, other than resizing each individual face part and replacing them in the right spot (kinda difficult). I've tried joining all the meshes and resizing them all at once in edit mode, then separating them back into separate objects, but that results in an error when I import it into the .pngxxxx file. I've seen the "big head" cf pack, so I know it's possible! Just wondering if there's an easier way... lol