Ok lets get started.

Pros: I like that you have chosen a natural environment for youre map. The river looks really good, but it was some things that I did´t like with it. But back to that later. These stone walls you have build look realy nice with that old/ruin look. And with that stone texture its just perfect. Spawn layouts are not perfect but they works for me, and the map size are good aswell. I relly like the skytexture you have chosen, its reminds me of the sunny sommerdays. The bridge over the water is a nice touch.

Cons: Ok you have huge lack in the detail department. When I tokk my first "walkthrough" of the map I saw the butiful water and sky. But when I walked by and looked at the trees and the ground everything was just... well ... dead. The trees had to leaves and everything was just quiet in a unnatural way. Enemies can easy be spoted across the whole map and more cover is needed. Youre 3D skybox doesnt look very realistic at all. And the water just ends up in nowhere. The river/pelvic bottom is rough and doesnt look realistic at all.

Improvements: Edit the terain and add some hills for more cover and life. Maybe add some buildings in the same look as youre stone walls. An underground area maybe a tunnel across the map would be cool.

Add more detail to the ground.Use the nature/blend textures to create paths on the ground, and add some shrubs, stones and smaller trees to make it look more realistic. Smoth out the river bottom and fix the 3dskybox so you cant see the end of the river. add more detail to it aswell. so it looks like a forest. And Use the texture application tool to get rid of the miss alignement of the grass texture where the 3dskybox starts. ( Simply "treat as one and scale ± 1 and turn on texture lock before you scale down the skybox.) To get rid of the "dead" look for youre trees just select them all and set the "skin" value to 1 or 2 to get models with leaves.

If you want to extend the whole forest feeling. add some birds that flying around and a forest soundscape with birdsong,wind, water and that type of sounds.

Improve these thing and you will get an wonderful map.

Don´t let my critic crush you, I think you can do better. Learning by doing, and improve to youre next version.