Looking good and a warm welcome.
Looks great. You might want to move some of the housed downward since they look like they are kind of floating.
@Dwayne is correct. The hillside is ground that’s slanted down in some places, so part of some of the houses need to look as if they’re also slanted down, thereby following the slant of the hillside.
Other than that, looking very nice, and welcome to the GameDev forums from me as well. 
Looking more down to earth buildings! Well made island.
Welcome to this site.
Take some time to look around and take part, support, and encourage other students.
If you check the ground below the houses in your first render, you can see a black bar of shadow.
The light hits your houses from somewhere above and to the left of the camera, so that black bar can only be from air between the base of the house and the surface. Flying houses! It’s a feature, not a bug 
If you check your second render, you can see you’ve eliminated that bar. No more flying houses ó.ò
Jokes aside, that is a beautiful first project! Congratulations on finishing it! Well done! ^^
We ran the numbers and found that the black bars detracted from our brand image.
Thanks!