Masks allow me to show and hide certain parts of the textures. I added a black fill layer to the top of my model and added a white mask to this. I then added a red fill layer under the masked layer. I then re selected the top layer and selected the parts of the model I wanted the black to be removed on. 
Before Mask –
After Mask –
I had trouble getting the normal maps working on the render. This is a problem that I will research into how to fix later.
This is what the render looked like without maps. I liked what this character began to look like as my style of colours was to make the turtle look almost robotic.
joshforrestnextgen 