I deleted all the lights in my scene. However even without light some of my textures are uniformily "lighted up", or at least visibleas you can see on the picture. [![enter image description here][1]][1] The visible textures are psd files I put via texture nodes.
This makes my textures very flat looking. Any idea what causes this and how to get rid of it? 

  [1]: https://i.sstatic.net/Eg6pT.jpg