Too much time on your hands...
I will reply after I take a look.
Edit:
The suggestions are typed directly below the respective pictures. This is likely how I would have the layout of the map, which is why my suggestions seem declarative. They are just ideas to help your frame of mind in constructing this map, and hopefully I am able to spark some thought into the layout and design of the map.
Red: The water is okay, but I feel it is necessary to put something of value in the water to make players use the passage. I recommend moving either red armor or mega health into the water.
Green: The railgun seems a bit out of place. I would move it into the room where the mega health is currently located (blue).
Blue: I recommend moving the mega health out of this room and either to the center or in the water (depending on where you move the red armor). I also recommend leaving the boxes out of the map. I feel they are an unnecessary obstacle, especially since there is no upper level onto which to walk onto the boxes.
Replace the grenade with a shotgun. The shotgun is very essential weapon for close range.
Replace the Yellow armor with a 50 health and move it on the platform in the base (where the 25 health is located), or replace the 25 health with a 50 health.
Move the railgun into the mega room and replace it with Red Armor or Mega Health. Also, replace the shotguns with plasma or grenade.
I recommend making a bit more space between the flag and this wall.
This next change is rather crazy, but maybe you can make something out of it:
Break a doorway into the wall (and make a small platform on the right of the water) that opens into a hallway that leads into the rocket launcher room.
Move the jump pad to the right wall so there can be an opening from the hallway leading from the water.
On a side note, the jump pads push players a bit too high (I suspect that is because this is an alpha). Also, I feel it could be possible to replace the railgun with a rocket launcher if you feel so inclined. The rocket launcher is a very essential weapon, and it may be okay to have two spots for it. If you can find a way to approach that, then the change may be justified.
The layout shows promise. I'm surprised you were able to construct that so quickly after your competition entry. I look forward to future releases.
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[url=http://teameventhorizon.com/]Team Event -O- Horizon[/url]
[url=http://mapping.maverickservers.com/]NoGhost Map Making Competition 2 (June 2010)[/url]