Hi Wisemoon, thanks so much for going to all the work of doing this. Regarding the photorealistic trees portion, I've made some heavy modifications to the tutorial. While it would probably require too much effort to incorporate these into this tutorial, one thing I can suggest that will help reduce the beveled look of the forests somewhat is to set one of the Tree color layers (preferably the middle green tone) to "Multiply", rather than soft-light or overlay. This will help the color to saturate a bit more. Otherwise looks great.

Cheers,
-Arsheesh