ummm. I mostly use whatever feels good at the time. XD;;;; I don't play around with omacity much, or at least I didn't with this pic. For the skin I prepare a palette, then I color the body, then I add in shadows, and deeper shadows, and then a little highlights, and then I use the finger-like tool thing to blur them together. Before the tablet I tended to use cell-shade style, because mouses =/= precision. ~__~; As for the hair I colored it all a solid color kind of on the fly (no real lineart for it beforehand), made sticking-out locks with the finger tool, then went crazy with the highlight and darken tools. (not sure what they're called in english) The trick with hair is to keep moving with the flow, so that it looks like many hairs going in roughly the same direction, not awkward random locks of saiyan hair. XD;
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I hope this helps a bit. ^^;