Here's my first attempt at following your tutorial, though without the stream. I probably could have used more opacity in a couple of places, especially my cliffs.

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I do have a question about the tutorial -- on the fancier damage layer mask step, you seem to be saying to add a layer mask to the clipping mask and I couldn't find the option for that. I tried a "Hide All" and it put a black mask on the damage (the part with the Difference Clouds), but what I tried after that didn't seem to match what you had written, and I liked the damage the way it was, so I got rid of the mask. I'm sure it's just my lack of familiarity with PS that tripped me up.

As for interiors, I was talking about dungeons and buildings and caves where creatures live that the PCs are supposed to encounter.

Thanks,

AJ