Hey Kevin, if you are looking for some advice: the idea for the scene is really original, and especially the muddy water is not seen oten around here, but the image is lacking impression of depth, if you allow me to be honest about it. The depth works well from the foreground to the skulls, but after that is looking rather flat. My eyes can't find the right anchors to get an idea about scale beyond that point.
If you want to have an easy time, you could place trees right behind or even at these poles with the skulls, so that we can only see some tall trunks, and some groundcover mixed in between. So essentially, you'd only have a small area to oversee. Could be cool actually.
You could blend the colors and light away with a distance shader, as we look deeper into the woods.
Cheers,
Frank