You are very welcome! Sorry about some seams being visible, I tried to make it as fast as I could so I might have overlooked some things. I really should pay more attention.
That’s not my procedure but it’s very close to what I will be doing in the future. Right now I am using free images from Pixabay, make them seamless in Photoshop, make the Displacement and Specular map in Photoshop. I make the Normal and the Ambient Occlusion map in ShaderMap. This is the point where the texture is complete. I implement it in Blender and sometimes I render with KeyShot.
In the future, when I get a high quality camera, I will be photographing terrain myself and using Agisoft Photoscan to generate Orthophotos from which I would continue with my current process of creating textures. Maybe I will experiment with Normal and Displacement map baking in ZBrush by using the mesh from the scan.
Anyway, I am just getting started with this and I have a long way to go.