I like, I like its a nice base to build up on,
its all about experimenting mate.
At the point your at now I would go in with a combination of the small pore alpha and Speckly alpha as your brush, set at a maximum brush spacing probably a quarter strength and just start building up on the tone.
I used this chart that come in real handy for me
http://www.bruiser.ca/skintones.html there is also one i use here
I just try to replicate the colors in Sculptris. Another bit of advice is to save your work often when you get to a (happy with it point)
Lastly comes the fun part for me anyway the detailing and think Random
by that i mean dont think about where you put your small blemishes just do it.
Do a couple or three look.... like? carry on..Look dont like? Ctl Z.
with Moles and spots and such its down to preference and what looks right in your mind.
But anyway bud keep up the good work sorry for such a long post