Which of these colors are you trying to replicate?
the shoe primary color
OK. It looks ivory to me. Are you seeing an ivory? The smallest dot of brown in a small bit of fondant or BC and then add that gradually to your larger quantity until you get the desired color. If you don't have brown, start with a tiny dot of orange and even smaller dot of blue to get the brown hue. Hope that helps....
Cute shoe! Can't wait to see yours!