So, the first thing to do is to obtain a tileable grayscale reptilian scales image; we'll start from an already existing image obtained from an old and larger texture I had painted in Gimp for a dinosaur model some years ago… but that's a different story.
In any case, if you prefer, you can paint a new reptilian scales image from scratch by using painting software such as Gimp or Photoshop or open source applications such as MyPaint (http://mypaint.intilinux.com/) or Krita (https://krita.org/).
We are taking for granted that in your Blender User Preferences window, you still have the Import Images as Planes addon enabled; if not, start Blender and just enable it as already explained in Chapter 1, Modeling the Character's Base Mesh. Then, follow these steps:
Select and delete the default Cube primitive in the scene. Select the Camera and the Lamp and move them to the 6th scene layer.
Click on the main File menu and then on the Import...