5 Custom made Reptile Scale alphas to use in ZBrush to create base detail on your models, which can then be further refined and polished by hand. 

Check out the Timelpase video below to see them in action: (Skip ahead to 8:00 min mark of the video)

YouTube: https://youtu.be/BxBf7ZS3UdQ

This set will give you enough variety to block out your designs, which can then be defined later in the detailing stage in ZBrush. 

Easy to use/install 3 steps: (see attached image reference for more information)

Import the alpha into the BrushAlpha channel box
In the Alpha Tab open up the Modify tab and scroll down to the Surface button. Turn this on.
In the Z intensity adjust the strength of the brush to your liking .