After getting some feedback, and improving this build, I have finally finished it. It took me around 8 hours, with all the Blender meshes, simple builds and grass terrain. This is my very first showcase, so it might not be that good. I am still looking for advice though!
Iād love some extra feedback on this map! 
Your Poly Island looks so cartoonic and remarkable!
The trees, house, and the lighthouse looks really cartoonic.
Though if I were you color the house with a more lively color.
In all, good job!
Looks great!
One suggestion might be to add depth in some places. The only height differences is the ground and walls. Adding either in area that drops down or some more layers on top of the ground may look good.
