[Tutorial] How to Make Custom Planes

[Traggey]

I suggest you use Xnormal instead of the Nvidia plugin to generate normal maps.
It's way better and works very much alike the Nvidia plugin.

Also you must invert ( CTRL + I ) the green channel of the normal/bump maps, otherwise they will cast shading on the wrong side of the bumps as I can see the normal map you have here does.

Also for generating normal maps you should make sure to generate from a proper grayscale, where the deeper parts are darker, in your bumpmap the rocks are bumped inwards instead of out, which should be the result you're looking for?

As for the specular maps, white parts = more shiny, black parts = less shiny, so I'd suggest redoing this specular map aswell as it seems very off.
What I'd recommend doing for the specular map is using Xnormals ''Normals to Cavity'' function which creates something called a cavity map, this is basicly edge information, it highlights the edges of your normal map, this can then be used in the specular map to make some more realistic speculars.