you have to know for yourself if what you are about to do is more a copy than anything else. Unless you copy my text and steps exactly, I can hardly do anything about a tutorial you create from scratch, even if the idea is the same. If you personally are spending your time well by redoing something that is already here is up to you and surely depends on the extend of the changes you have done to the process (and how well you will explain them).
This is really great! I think that the only details missing for making it looking real are some bright white spots on water surface were it's hit by sun (since water is never completely flat), and maybe some darker traces of humidity on the walls were the stone is in contact with water