The skin tone is made with a rather simple recipe:
1. Tallarn Flesh
2. Tallarn Flesh / White for highlights
3. Tallarn Flesh / Dark Flesh for shadows
4. Ogryn Flesh for the whole model (and maybe Devlan Mud for the shadows).
And here my biggest "mini" so far, the grumpy old man:
If you like to vote: http://www.coolminiornot.com/276062