Texture.

These three pictures show texture by taking the picture at an angle so it pops out.

These three pictures show texture because the water in the waterfall is popping out, the coconut is taken at an angle so you can see the fuzz on it, and the water drops on the leaf pop off of the leaf to see the texture of the drops.

These three pictures show texture because the whole picture is filled with a pattern or is taken at an angle that you can see the texture pop out.