http://www.learnmakeupeffects.com/sculpting-prosthetics-reptile-skin-textures/
This video covers the second in a series of texturing for prosthetic sculpts, and in this one we'll take a look at creating reptilian and scaly textures.
By taking you first through a series of exercises, you'll see hoe to quickly create large areas of irregular or regimented scales, wrinkles and bumps quickly!