Ivory throughout, just a two or three toothpick's worth of rose/pink, and gradually add brown until you reach the desired darkness/skintone.
I used this combination for the baby cake in the link and noticed that it was a VERY realistic skintone. The more brown you add, the darker the tone. This was purposely supposed to be a darker skintone, but it went through several stages of very realistic looking lighter skintone. I jokingly called it my "pound of flesh" LOL
BTW I used only Wilton gel colors.