inb4 conan
fuk u u little asswiep cunt
both builds are nice but have their small shortcomings
for the first, you're clearly going for a high-detail build but you can still clearly tell the borders of the bricks of the base you built, then stacked detail upon. use more 1x1, 1x2 plates and vary up the textures of each level of terrain, such as by adding plates near the border of layers, or on ledges, to make them less flat and simple. the excessive use of 1x1 rounds also kinda stands out but with 1x1/1x2 plates stacked on each other and scattered around, it wouldn't be as stark of a usage.
vines are good though.
Island has similar issues since the size:detail ratio of the build is kinda bigger than i would normally expect from builds that size. but if it was expanded and larger it wouldn't be as much of an issue.
like I said above, stack 1x1 and 1x2 plates to break up the brick "layers". Always remember to scatter them with single plates as well though so its not just using one "kind" of "brick" to vary terrain.
tree is neat but a little short, but i guess that's the limitation of your leaf brick.