Here we go:
your sites pages seem to almost be exclusively pics with imagemaps, or tabular images with links and rollovers. which looks awesome, but isnt really that accessible. there is no text to copy and paste, nothing for Google etc etc. but maybe that doesnt matter to your audience.
your main menu page, the title is "main.gif" - on purpose i dont know
rollover "collection" the image change is off by a few pixels.
you are using tables. not "good" but useful. in your case I think your site, and you, would benefit from switching to CSS backgrounds, hovers and hidden objects. the overall look of the site wouldnt change, but the functionality of it would increase dramatically.
and for these images ALL being black and white, you really didnt compress them at all and they load incredibly slow.
if this is a "portfolio" site, you should make the actual "artistic works" part of it be accessible with some sort of list, menu, thumbnail gallery, whatever. Your, this is the first image with a next and last button, doesnt cut it.
at the very least, re-compress your images.
at the very most, re-design it with CSS.