HOW CAN I IMPROVE MY MAPS ?

The stairs are supposed to go "up" to the doors, however, the doors are level with the bases of the walls to the sides of the doors. The bases of the walls are touching the ground, whereas the doors are touching the tops of the stairs, several feet above the ground. So to make it look correct, the walls to the sides of the doors need to come down about one tile further than where they stop now. Like this:


The way you handled the building's size looks good. It's a good map overall. The shadows next to the little stone ledges on the sides of the doors are still messed up - they should be semi-transparent.

I think it would look odd if the doors were identical to the windows. So if you're using those taller windows, then don't change the doors back to how they before.

If you can't make the shadow transparent, then yes, go ahead and erase it. Lots of things in RPG Maker don't have shadows, so the ledge lacking a shadow won't stand out. But that crazy non-transparent shadow really stands out.

Go with this one:

Also, unless your game takes place in the mushroom kingdom, get rid of the mario pipes and the mario flag.

Yes, remove the Mario stuff, find a real trashcan

That works too. I don't know why I picked the other, except that it was less boring to have two different types of windows up there. But looking at it now, it doesn't make sense to have the darker windows, because they imply that the lights are out in those rooms, which is of course not the case during the school day.

You should be making the houses wider - roof wise. How many houses do you see that are taller than they are wide? Seriously? Make the roofs at least two or three tiles bigger to at least give the illusion of there being an inside. And the top house... you need to fix the tiles used for the walls. They're terrible.
Also, dirt paths or paths of some kind from the doors to a sidewalk (which you seem to be missing, btw), to show where people walk. Any grassy area that is walked on often will eventually become a dirt path of some type.

House size looks much better. The edges between the grass and the building/road now look correct. The edge between the dirt path and the grass looks wrong now. The bottom edge of the dirt path looks right but the top edge doesn't. You didn't follow my instructions. You shift-bucket-filled one section of grass and then didn't touch any of the sections of dirt, instead of shift-bucket-filling all the sections of grass and then normal-bucket-filling all the sections of dirt.

I'm sure you know how it's supposed to look, it's just a matter of getting it to look like that. Maybe you should just experiment with the shift key until you learn how it works... The shift key means "don't autotile". I've told you exactly how to do it twice in this thread now, so if you still can't figure it out, just screw around with it until you get it.

The size of the streets are fine, but you do need sidewalks. Also, now the house looks much better. You're also learning to use the tricks of the trade.
Next part? Add some longer grass, plants and trees. Not too many, but some so that it doesn't look so bare. Think of it this way - the grass you currently have is newly cut grass - just mowed. There's longer grass for those yards that aren't as cared for. Also, fences~

Usually sidewalks are cement. Is there a cement-like tile among your tiles?