Hi, SammehSAMURAI!
Excuse me for answering so late

I didn't do something special about monster skin.
here's the tutorial how I made his skin.It's simple

There's 3 type of scale.
1st scale using Alpha 1 is normal scale covering almost all of his skin.
I downloaded mudpusher's alpha from ttp://www.zbrushcentral.com/showthread.php?24320-Dragon-skin-dragon-scales-Help
2nd scale using Alpha 2 is the boundary line between scaly skin and normal skin.
I made this alpha in Photoshop from mudpusher's alpha.
Alpha 2
3rd scale using Alpha 3 is Large scale being in a line.
I made this alpha using Zbrush "Grab Alpha From Document" function.
Alpha 3
Please note that I'm not good at English!
and I'm sorry if you are hard to understand my English