What is this, Water Color? it sure looks like it. I did a piece a few weeks ago in water color, but nothing compared to this level.
As I noticed with another users art last night (Or rather very early this morning,) this has a strong impressionist feel to it. I like this is the fact that although some of these are blobs of color, you have manipulated them to the point that they actually have a simplistic form that truly makes this piece. You really know this medium. I can see you even used a pen in appropriate places to add that hard edge when needed. This piece shows some serious skill indeed. This is something I would easily hang on my wall.
Your composition is nice and you have done a swell job at balancing this. The style is simple and effective.
One problem though, I am noticing some blurring in some areas. I'm going to say that you used a camera to take this, am I right. I understand that not all of us have scanners big enough to support what mediums we work in. (Mine is only a 9''x14'' so I can understand.) It's just a shame that some of these areas are a little blurred. Try this Documenting your work Tutotial by out own Art101: http://art101.newgrounds.com/news/post/314936
Hopefully you can crisper images as well as a bigger high resolution image.
I see you put a couple of other pieces in the portal that are a similar style. It will be enjoyable to look through them all and perhaps review a few more.