You have five brushes and a prefab, ridiculous. Not only did you exclude lighting, but you stole someones work without crediting them. That's not good, and this map isn't either. Rethink, read tutorials, and trash this map. I made at least eighty maps on my own, without tutorials, when I first started mapping. I didn't start releasing until I had mapped for at least five years. Shouldn't release early work unless it's praised.
Well, there is no lighting, which is a huge negative. Also you used about 4 textures the entire map. What is with the white wall texture too, it isn't even dev, and look pretty bad.
Also, isn't that bunker this? If it is, then you need to add the author, to your author field to credit his work.
You could've put some props and more walls in, also made the map a bit bigger as well. All that is there are 4 blocks with a pre-made bunker. Look up some tutorials on proper mapping techniques before releasing your first maps.
Anyway, a different ground texture, and a sky for the top would be nice instead of just the same white texture.
Last thing, take some better and clearer screenshots, looks like you used a digital camera or something. Just press F5 in game to take a screenshot which is much easier and clearer.
Overall, I can't even think of this as a finished map, it still has alot of work that could be done to it.