I'm not being nasty, but I'll give it to you bluntly, so are you ready to be flamed?

The abstract thing is "so last year". Seriously, it's all about designed graphics in website headers. Abstract is so easy my 7 year old niece could do it.

I dislike how the sides of the website don't continue to the top of the page. It makes the image seem seperate, or even out of place.

The Red / Yellow has to be changed! Try #EFEFEF as the background with your blue for the border. It sticks out so badly I just closed the site, the first time I opened it.

If / once you change these, I'll have a better look. These are just a few things that stood out to me

EDIT: Also you should know that the <center> tag/s are deprecated. This needs to be used in a <div align="center">