The Tunnel represents Value and Contrast. This photo is a example of value because the edges are dark and then the middle of the tunnel is light. This also represents contrast since the outer darker shadow makes the leaves and ground more noticeable from the rest.
This beautiful photo of an up close kitchen brush represents depth and contrast within the elements of art. You can see the enchanting high definition which allows you to see even the finest of highlights.
This picture represents texture because you can see the little details on the shell. The pattern on the shell makes the person.