It looks "designed". But it's not designed for the medium it is presented in.
I would say that a professional web design firm that makes a site consisting of purely images and image maps is missing something.
There is NO text content on your site at all. Anywhere.
Let alone accessibility issues, are you hoping for any kind of search engine visibility?
Without text content your site is invisible to anything other than a "regular" web browser.
There is no reason at all why you cannot render the text as text instead of a picture. It would even be better if the text was done in Flash, at least some crawlers will be able to index that.
Put the URL of your homepage into this
It will show you that to a spider there are NO followable links on the page!
Also, the code does not validate.
Sorry, if that's a harsh opinion(hey, I have a hangover!) but it's meant to help you make your site better. Personally, I would say you are graphic designers and not web designers. There is a difference
Web design shouldn't just be about putting pretty pictures online. You obviously have a good visual eye, better than my own. Some of you other work is way above what you have done for yourself.
From a visual design point of view: 7/10
From a web design point of view: 2.5/10