Thanks for the compliments everyone!
The white was kinda funny for me. I bought the reaper ivory triad for the job. But that didn't work out...I was too yellow. So I used the out of production GW Dheneb Stone. I don't know what the appropriate reaper color is, but I think it would be in the bone triad over the ivory triad. The biggest thing is it has to be more "brown" and more "cold" than ivory. I think Dheneb stone has some cool colors in it, hence why it worked out.
Basically the white is layers of Dheneb Stone mixed with GW Skull White. Dheneb Stone is how dark you start, and pure white reside on the VERY top of edges/surfaces. When necessary, very deep shadows were created by mixing a bit GW Khemri Brown with GW Dheneb Stone.