Wow, this map is very nice !!!
I like the night-style, lets the lights look well.
This layout is pure fun, just tested it online and i couldn´t find any errors, as far as i could see that. Map´s speed is also very good, even with all fx and /grass 1.
Textures look a little bland, but i prefer a fast gameplay, so it´s ok.
The only thing i´d change is the position of the quad, maybe it could be in a less "reachable" position.
VERY nice work for a first capture map, congratulations. Small, fast, effective and nice layout !
I´ll rate it
4/5 ;)
[edit] : Hehe, i just forgot about that lighting in the sky, i think makkE is right too, a small lightsource in the sky would add a nice atmosphere with nice decent shadows ;)