Skin Tones - E500 and RSP

I'm having great trouble getting Emma's skintones right with the above combo. I'm totally new to this - normally I shoot landscapes, and accuracy is irrelevant (I know what was there, the viewer sees what I choose them to see).

Emma's skin is basically sand coloured (a look most people need makeup to get). I get a choice of pink or slightly blue. Sand, I can't get.

Tips?

Or should I use ACR for portraits?

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http://www.flickr.com/photos/acam
http://www.pbase.com/acam/