Chaos Sorcerer of Nurgle part 1

So, I've started work on a new miniature. Its a Nurgle Sorcerer, or Herald of Nurgle. I'm using an airbrush and washes mostly. This will be my first time using oil based washes and I'm trying to do the whole process properly and take my time. Here are a few progress pictures.
Primed with Vallejo airbrush grey primer.

 Airbrushed the skin with Reaper Master series Dune Shadow.

 Added Model Color white and airbrushed the highlights.

Next I will be doing both a purple oil wash followed by a blue wash.

This is the skin color I am trying to achieve.