Well I wouldn't call myself a savant, but I have a degree in mathematics and I work in a related field, so yeah, I can often visualize what this stuff is doing in my minds eye. This one is a quick and dirty (no pun intended) job, so there's not too much going on mathematically speaking in this shader. I'm just blending some random patches of rough dirt onto the skin. It actually looks more like she's been burned, doesn't it? I should probably run the dirt through a colour ramp to stop it being jet black and I should lift the dirt bumps a little as well - there are some places where it kind of looks like the dirt is carved out of her instead of sitting on top of the skin. I was basically just trying to show how you blend a dull bumpy surface with something that's a little smoother and shinier. Hope it helps :-)

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