god i hate this kind of terrain. its not particularly bad but it doesn't take that much effort to make better terrain.
try not using cubes and zone bricks.
(i should clarify: not totally hating on this style. its useful but it has annoying traits that can't be rectified unless using lots of extra bricks, and at that point you might as well just not use zone-heightmap style)
i like the trees though; although unrealistically scaled, they're cute and well done.