You really need to add some lighting to the map. It looks way too bright with all the orange textures and is hard on the eyes. Put a light_environment in so your skybox will give off light.
The textures could use a little variety. There are about 3-4 different textures in the map which can get really boring. There are other dev textures, so try to use as many as possible to get a nice blend to the map.
The brushwork is pretty good, but lacks in detail. Most of it is blocky and could use some more unique shapes instead of just rectangles.
The map is also really empty. You have a large open area in the middle which offers no cover. Try adding some more props, brushwork crates, or a building or two more. This will add some gameplay value to the map. The way it is set up now, most people will just camp in base, instead of risking it to go in the middle.