Select all of the river rushes - delete them. Open up editor and make three copies of your river rush.
Call one Light Green, one Medium green and one Dark Green - then adjust the colors of each to make a light green, a medium green and a dark green (Keeping your brown default River Rushes).
You can do it one of two ways, you can use mostly brown and add a bit of your greens, or you can use mostly green and add a bit of brown. I used mostly greens adding a bit of brown to give the look of early summer or late spring - lots of life for this scene.
Instead of using the river rushes rushes - use the cattails instead. The look better than the flat looking rushes "cattail" thingy.
In nature the banks of any body of water would be where the rushes are found. If your using lily pads they would be in slightly deeper water than rushes/cattails. But not too deep.
While you are at it allow for a wider range of scale - use smaller rushes spread out over the empty land area here and there like tall grasses.
Air fog is needed - duh. In game the Far Z is around 5000 tops - unfortunately that amounts to about 6 large grid squares of distance in the editor. Far Z is described in a circle so its 6 grids side to side, not six grids diagonally. Thus your far sky looks way hella close.
Ground fog. Use two regions one on top of the other. Set one with light fog and the other with heavy fog the combined fogs look better in the game than just one or the other.
Lay in a few regions of colored fog in the water with an over lay of the gray - say green fog just in the water even in just the deep bits of water so it looks like fog is rising out of the water.
Use one set of natural growing things OR try to tint everything around the same area.
You are using the brown rushes along with a very light fern, a light grass and dark trees - its not going to work this way. Get everything light or dark.
Stuff on those steep hills: No. Nothing can grown on that steep of a hill - except maybe hardy grasses. Rock would work, lowered (ctrl page down) embedded into the hill side. Those tree things are trying to grow on what is virtually the side of a cliff - it ain't going to work.
You could lower and spread out those hills, or you can make them into rocky outcroppings.
Ideally those hills shouldn't even be seen from this side of a swamp. Between trees, shrubs, grasses (rushes) and all of that stuff those hills should be in the far back ground just barely seen. With a decent atmospheric fog color and density those hills should be very hazy.
If this is really a swamp then it would have bogs or bits of land here and there, it would be shallow and full of things like frogs, Skinks and other critters.
This also lacks birds, bats, flies something to fill the scene with life (other than dying rotting tree trunks.
Moss is missing. Swamps usually have things hanging from tree branches. There are cliff vines and other hanging vegetation doodads that you can tint and shrink and make "chains" hanging down. Raise and lower holding ctrl and using the page up/page down buttons.
Throw in some dead logs - cover with something small and vine-like - if you can knock together a customized something or another that can pass as moss, then toss that on your logs - then add a few small (very small) mushrooms on top of the log. A semis submerged over grown log would give the impression that this is a stinky, rotting swamp where the circle of life is doing its wet nasty thing.
Swamps are "dark" due to the canopy of trees shadowing the stagnate waters below - there isn't the feeling of a dense canopy due to the lack of tree trunks.
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Oh well have to change it then, to make it more clear to see.
