Welcome to the forums.
In your first map you did a good scenery usage.
Your polys are really messy though. I don't know why you did so many squares!!! you did a nice shading with all that caos. There are polybugs because you didn't overlapped them.
Try to use some colors next, this map could have at least some grayish ones.
You can find some mapping tutorials
here and a proper site to upload and share your maps on
TMS.