Is that this scheme?
If so you'd probably be looking at sand for the lightest colour, and light brown for the shading. BuyPainted usually uses some combination of Sand, Radome Tan and Light Brown when doing bone colours with his airbrush and it works really well, I could dig up a vid if you're interested. Here is the 3 I have with airbrushed colour over white primered bottle top if it helps see the colour. Bad lighting, I suck at photos.
If you wanted to be *really* light cream, you could probably base white and then do multiple thinned sand layers as you get closer to the shaded areas. Buypainted tends to airbrush sand and then airbrush shade with light brown
iirc but that of course results in a darker overall effect as even "light brown" is dark for cream - but that's kind of the point with shading really.