*** TYPO. In the early part I've written: "Gradually add more layers set to multiply for shading - or set them to opacity for high-lightning".... It's meant to say "set them to OVERLAY for lighlighting" of course. I'll try to get this changed asap

I wasn't sure whether to submit this or not. But since it's already done I thought why not? Someone may find it useful.
There's a lot of text here. I personally like step by step guides with a lot of text. It's easier to pick up information from an explaination than from just a series of images.
Questions are welcome

Original painting can be found here:

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And the textures in the zoom are gorgeous!
(Sorry for my bad english)