At first glance "The screenshots" I thought this map would be to dark but when I tested it I was pleasantly surprised. I'm not a fan of dark maps, but you did an excellent job with lighting up all the areas and there were no real dark blotches anywhere that I seen. I like the soft colors of light mixed in around the map. Very nice work. You also did a very good job sticking to the aim type theme. Plenty of up close battles along with some sniping areas. Good, well balanced mixture. I like the idea of the one tower in the middle, it makes for a fun time when fighting for the tower rights. The map is a bit plain with no rounded corners or walls but you got the job done with the layout and balance. There are a few small things that I think would enhance the looks a bit and help improve gameplay.
In the screenshot to the right you can see where the sniping area above both spawns are pretty open. I think that by adding some crates to these areas, it would give the players some cover from the opposing spawns sniping area. Not to many though because you don't want to promote camping up there.
While on the subject of sniping, you can see from the screenshot on the left, that the view from the tower in the middle is limited unless you jump up on the walls. I think if you were to lower these walls a bit or maybe even make the walls thinner "or both", it would increase the sniping view and you would not have to jump onto the walls to see the players below.
Although the lighting its self is very good, I would add some light props to these areas. Example right. You can see a spot of light on the walls but where is that light coming from? A prop light fixture adds detail to any map and gives it that finished look.
The last item is not that big of a deal and is a very easy fix. To the left you can see where the textures on the floor going into each spawn does not quite blend. This was the only places that I noticed on the entire map where the textures did not blend.