I like the top half ... the dark areas, looks like a casino site. But as you scroll down you get lighter and lighter and your eyes just sort of fall away from the frame.
So from an overall visual point of view, the first thing that I would do is make the colors at the bottom of the page very similar, if not identical, to the colors at the top of the page. From what little I know about graphics, photography, etc ... you want to "frame" your image with the dark colors. That helps keep your eyes drawn into the heart of the image.
I'm sure there are exceptions to the rule but that's what I was taught.
Good luck,
Charles
8^X