So,
The belly and stuff was based with Kmehri Brown, then a layer of Bleached Bone. I then washed it with Devlan Mud. I then applied another layer of Bleached Bone. As the last layer I used a mix of Skull White and Bleach bone (+- 50/50) and kind of highlighted the higher regions of his belly.
The skin was done with a layer of Lyanden Darksun, then washed with Devlan Mud and plenty of it. I then drybrushed Lyanden Darksun over it again.
I did the horns with a bascoat of Khmeri Brown. Then I put ona layer of a mix of Khmeri Brown and Bleached Bone. I made sure some of the basecoat was visible. The next layer was the same as the other, but with some more Bleached Bone added. Make sure to keep the previous layer visible. I topped it off with a layer of pure Bleached Bone.
Oh and dont forget to thin your paints.
Thanks for the comments ^^
PS, i had the inspiration for the colors of the Slann from the Legion of Abraxas thread, made by Arsenal.