That looks pretty neat, but i think it would be better if you use the wall tiles by default, I saw you made them bigger than 3 x's which looks disturbing a bit.
I see you have a problem with the NPC placing, use this.x= and this.y= to place them correctly, you may also use the setimgpart to cut the image (like the bamboo rod icon) and make it fit thru the wall.
I see you also have problems with the placement of Details (like I have) - if you could train and add some smaller details your levels would look great in the future.
@your outside level, the bushes around the house aren't exactly needed, keep some bushes on the front - move your house to the middle to avoid blank space and try to add lots of details, sometimes a beach with water next to it or difference houses as an horizon would look great.

What MSM said "avoid using square shaped levels" by that I think he means to use move shaped angles in one.
I'll provide you the iEra Tileset when I can. Good Luck on being a LAT, I'd recommend you listening to Snake Rekon, he got me where I am now.