I appeal to your knowledge:

I have a wargame from the 70s that I want to modernize the map. I would like to make it similar to this.

My tools are: Photoshop, Illustrator and nothing else.

I would like to know if anyone knows any depot of textures for the desert, rough terrain, grass, mountains, that is similar to that image. I would like to know some technique so that the terrain is not flat. Some advices? Thanks in advance.

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