I would remove the oak trees (because they look hideous and i dont know why people use them) and also remove the silver birch as they don't fit with the rest of the foliage.
The rest is nice, perhaps a bit too much weed in the water that is randomly placed, try to organise that just like you would above water.
The patch of desert at the back also look well done.
Looks like a mighty fine swamp you got goin' on there
I like the colors of the trees and the dead/leaf-less trees look nice too
I would remove the oak trees (because they look hideous and i dont know why people use them) and also remove the silver birch as they don't fit with the rest of the foliage.
The rest is nice, perhaps a bit too much weed in the water that is randomly placed, try to organise that just like you would above water.
The patch of desert at the back also look well done.
there's actually supposed to be more dead growth than this, lol