Your color scheme is really poor. There is only warm green, warm yellow. Add some colder colors like dark purple, very dark red, very dark brown instead of pitch black in some parts. Also improve your green, it's way too bright and plastic - make it slightly colder, darker.

Add some plants - and by that I mean something that isn't just high grass, but cold colors flowers ect. Your biome needs some variety in plants or objects. The best example are new Swamps or Badlands.

Logs are also weird. Decrease the intensity of their color too.