Neat~ I like the cut out look.
I use Illustrator too sometimes when I'm doing lineart ^^
My only suggestion would be to add trees? The land looks a little barren
Awww, these are very cute. c: Cute and simplistic. Of course I do agree with what Pyon said, sometimes they look a bit empty so maybe you could add like a small pattern to the background, maybe like the little New Leaf logo or something. But aww, I'll make the Isabelle one my phone background, since I do need a new one. :3