Ok I'll go through this in some detail. First off, in the level editor you can press alt + 2 to take a screenshot or alt + 1 to take a full level screenshot (recommended). You can then upload the screenshot to this forum so you won't have to go on imageshack and stick it up there.
It seems you still need to practice on symmetry. Levels like your first and second one look best when they are symmetrical, however the top left is a different size from the top right on both levels (the length of the rooms on the first one and the roof on the second one).
1:
The overall idea is ok. The floor is a little bit plain and the level seems to be lacking content, especially on the top left and top right corners.
I like the little staircase-guard thing you made (using the table tiles?) running between the two stairs.
2:
All the doors make this look ugly. The idea is neat and I can kind of see what you were aiming at but you should try to re-do it so that you use less doors and possibly add some windows.
3:
Nothing special here, but you forgot to add the wall on the top part. The missile graphics are awful. I try not to use ugly graphics in my levels unless I really have to.
4:
I like this house. Not a fan of using dirt on the roof (c'mon now) but the shape is good and I like the overall style of it. I like the little roof bridge and how the two buildings are connected. Good job.
5:
I like some of the creative bits of this level (the stacked roof on the bottom, the pillars running along the beach at the top) however the rest of the level is very undetailed and plain. The grass touching the floor tiles looks more like a bunch of tile errors and the dirt stands out too much.