First 3 pictures are EXTREMELY Fugly.
The last one looks alright, except from the teleporter.
But considering the top ones are god damn ugly and the last one is kinda good...
I and everyone else could REALLY think that you have stolen the last picture/map.
But anyways, for now I'll trust you and give some ratings:
First 3 Pics: 0/10 (Would gladly give it less than 0, perhaps ~ -300/10)
Last Picture: 5/10
Could have given more if the boat area was completed to the south east. (atleast it doesn't look finished).
Also, when you do screenshots and there is more than 1 floor, go higher up and then press "Q" to remove shading and then take your picture - This way we can see height difference details and such.
~
If infact it is you who have made the last map piece, then you should ONLY focus on stuff like that and NEVER EVER try to do something ugly like in the first 3 pictures.
This way you can evolve at mapping and people will start to appreciate your work.
Because for now, Noone in the world except yourself find the 3 first pictures as good, sry.
Good Luck mapping, do as Luffy said, read some tutorials, it helped me quite a bit.
Also, take a look around the Mapping Showoff Section, look at all the new posts to try and find something good looking to give you inspiration.