How to add contrast on a doll

I've written many tutorials before but this is the first one I'm writing to put on DA. Right now it's exclusive to here because it doesn't really fit in any of the sections on my site.

This is a tutorial about how to add contrast to a doll. If you've just received CC that your doll needs more contrast, this is the tut to read XD. I'm showing how to use the Curves dialog in photoshop to do that, but that dialog also exists in GIMP, Paint Shop Pro, and a lot of other programs (Not MS Paint though)

The base for the doll in the tut is by