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Ok, I've never actually done a face-up but I know what to use...

Well Mr. Super Clear is the standard for getting that clean look... there are other alternatives, like Testors Dullcote.

Very thin paintbrushes are a must. They help with eye lashes, lips, and jsut about everything else.

Watercolor pencils also work for face-ups... but you have to be really careful.

Anything without oil should be fine. Oils tend to stain the doll.

Air brushing is another option, although the cost is a little high.

sweatdrop I can't remember what to use to remove the face up but if you roam around Den of Angels I'm sure you'll find it.
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i have a question.

is it possible to use fake human eyelashes for doll eyeslashes?

What sort of glue would you use to keep the eyelashes on?

And Mr. Super Clear appears to be the most popular thing to finish the face up. I've seen some very nice jobs done with watercolor pencils, but acrylics and normal watercolors are popular too. If you do use acrylic paint though, you might want to thin it out with some acrylic retarder. You could use water but that makes the paint thin, you would have to put lots of layers down. Crushed up chalk pastels are popular for doing some shading and blush effects too.