A creepy doll is on my short list of costume idea's. I originally planned on doing it for Halloween this year, but I think that plan has changed.
As for makeup, every day eyeshadow is always my favorite. Look into something like theatrical makeup for something long lasting. Ben Nye is a great brand. I suggest eyeshadow mostly because you can really get a great shadow look and it blends so much easier than something like grease paint would. Using a primer first will help with lasting. Even an eyeliner pencil can be blended out with a brush or sponge to make a shadow or faint coloring and will last longer than just eyeshadow.
Also, check out Youtube for creepy doll or living doll makeup tutorials. There are a lot of them and if you see something you like they will show you how they achieved the look and what products used.
"Who is this irresistible creature who has an insatiable love for the dead?"