Thanks for all the positive feed back! This is my second scene that I've actually put the work into to finish. I've messed with AM for a few years, but mostly haven't had time to complete many pictures.
Yes, I didn't use a lot of displacement maps. The ger is the only place that I actually used any decals though. I really wanted to see what I could do with mostly materials, and was pleasantly surprised at what they could do with some experimenting. Everything but the grass blades was modelled. I used the hair plugin for that. Much easier and renders pretty fast. The stones were placed by hand in the river bed, but it didn't really end up that you could see many of them. Has anyone come up with a better way to scatter little stones?
Again, thanks for the comments! Here's a wireframe of the scene.
-Nathan