Need help on a colour issue :(

I just bought a few units of these bad boys from ForgeWorld, and I'd like to get as close to the original colouring as possible.
I do not, however, have anything resembling it in my arsenal, so can anyone please help me figure out which colour has been used?

http://www.forgeworld.co.uk/en-DK/Shadow-Spectres-Aspect-Warrior-Squad

I am am inclined to believe that the colour of the photo is off. Have alook atthis artwork:

https://www.google.cz/search?q=shadow+spectres&client=ms-android-samsung&prmd=ivsn&source=lnms&tbm=isch&sa=X&ved=0CAYQ_AUoAWoVChMIoJ_SkqfzxwIVzFkUCh0LRApq#imgrc=O5OhE3Ke1k8_UM%3A

It may be just me but I think thats how they are supposed to look in a normal light by a naked eye. So the colours are those commonly used to paint bone.

It may be how they're supposed to look, but I really like the colour they have on the website, and I'm fairly certain it isn't just a trick of the light, supposed to look like bone.