If you want it to be extremely detailed make sure its a procedural terrain.  You're also not going to get good-looking results for plants if it is just added to the geometry of the terrain.  Just make your terrain without the plants and add actual Vue plants onto it.

But if you want it to be far away, just go under landscapes in the preset materials (i'd still reccomend your terrain to be procedural) and apply one that looks best.  If it asks all those questiosn about adjustig the procedural terrain or somethig click yes.  Render it ad watch vue work its magic.