I suppose this will work for Orcs as well, but for the moment the focus is on 40k orks. Here's a quick tutorial showing how to layer paint Ork flesh using citadel paints. Obviously this isn't the only way to do it, but is what I'm currently using. Depending on the look you're going for you can leave out a highlight or add a glaze, or even use different greens. Whatever the case, this method will work for any base-shade-layer-layer method.
I have an Grot/Ammo Runt/Grot Orderly/Gretchin tutorial coming next.
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How to Paint Ork Flesh
by Paul Graham | May 25, 2014