It looks nice for your first map but the third picture shows a square shaped building which is ok but try to spend more time on it and add more detail to it such as a balcony under the windows or frames around the glass!

For a first attempt, not bad, mighty nice!

Edit*

I just noticed there is grass growing through a wooden box on picture number 3!

Yeah, in the second screenshot, it doesn't seem likely that a chain-link fence could support that much concrete. Also, the stairs are a bit bland. I like the first screenshot, though. It has a very natural look.

What used to go through that tunnel. If it was a train, the tunnel is way to short.

The first screenshot looks lovely :D, the whole of screenshot two looks to grey consider changing the stairs as well. Screenshot three looks nice except for the repetetive texture on the rock in the background and the building needs some work, add a roof maybe

It doesnt look ready hehe