http://www.learnmakeupeffects.com/sculpting-prosthetics-skin-textures
This video covers the first in a series of texturing for prosthetic sculpts, and in this one we'll take a look at creating natural skin textures. This is the final sculpt with texture, and I have tried to cram in as many of the commonly needed skin textures in this sculpt which are pores, wrinkles and folds and raised goosebumps. These textures could of course be amplified or reduced by using a heavier or lighter touch depending on the effect you need.