Although your builds are creative and show potential, unfortunately- rejected. Your flowers build is pretty and nice to look at but it lacks in size. As for your nature build, the terrain is good but it does not show off your building skills, as it is mostly comprised of trees and water. Try filling space in your builds with structures instead of saplings and bonemeal. Your modern build is nice too, but the exterior is plain and repetitive.
If you added size and detail to your builds, you'd have a great shot at becoming Builder. Also, using different building styles can show off your skills better. Keep going, you show a lot of potential!