.:Making Your Own Texures.:. Bit of Help

[Neurological]

You don't need all the filters like NMap or Specular, you can have only the diffuse if you want, but the other filter are needed to add details.

NMap is the Normal Map, which it gives depth on the texture depending on the light direction. The specular map is needed to tell the engine which parts reflect light and which parts reflect less light.

With only the Diffuse the texture ingame will looks flat.