Nature Academy rocks tutorial. I got a little bored with the idea of just rocks and sky, so I added some flowers I made for the next tutorial (plants). I think even if it is a practical tutorial, you should try to make it a complete scene. Not every picture is worth a thousand words, but I can sure try to make it worth more than half a dozen.
I submitted this as my graded piece in the Nature Academy to get the Certificate of Completion.