I need to make some pebbles for my scene. How do I get the realistic looking pebble shader in Cycles? This is what I am going for:

[![enter image description here][1]][1]

And I have got this:

[![enter image description here][2]][2]


  [1]: https://i.sstatic.net/wyQVT.jpg
  [2]: https://i.sstatic.net/entFK.jpg