I wanted to do a quick review for ya!
The terraforming is alright, but as people said looks pretty much like natural terrain, something more dramatic would probably come off better.. especially with the title "great valley"
I think the build quality is relatively good, you are going in the right direction but the map looks a bit empty of builds, a lot just seems empty and plain, so try and incorporate more in there and it will be better
Cornucopia looks good but nothing too unique
Overall I rate the map a 5/10 has promise but you have stuff to work on before you get closer to a map being accepted