Once we are satisfied with the reptile skin shader created for the character's head, we can copy it to the other parts of the body, that is to the other material slots, and then apply the necessary modifications. Those, in this case, just consist of different color and scales image textures.
This means that all the other shader parts can be reused as they are. In this recipe, in fact, we are going to make a node group of these parts so as to easily re-use the shader for the other materials slots.
Just start Blender and re-open the previously saved
Let's start to create our skin node group: