JEEEZ you have alot of content on that site. Make it smaller first off, just leave in all your best work. Second, not one single peice has a discription on it, i really hadent a clue what i was looking at.
The whole site is very dark, or haunting. Alot of your work fits with it, but try brighten it up abit.
I'll second what Oldat29 said: Fewer images, add descriptions.
Increased consistency and improved gallery presentation/navigation would be good too. I was a bit disoriented when I clicked on a gallery image and was taken to very plain pages, and I was annoyed that I had to keep searching around the page to find the navigation each time (because the large version of each image is a different size, the navigation keeps moving).
I would also engage the visitor a little bit more. You have an intro on your home page and then that's it. If you were showing photos of your work in person to someone you'd just met, would you just describe what you do and then hand the person a stack of photos and walk away, or would you stick around and explain a little bit about each one?
As a visitor I would be curious about several things: What year did you create each piece? Was there a specific concept or event behind it? If it was a photo, were the effects created with Photoshop or by the manner in which you shot the photos (lighting, film type, lenses, etc.)? What about the paintings—which techniques/media did you use on each one? And the t-shirts? And what about "For Your Walls"? How do I know if I'd be interested in having it on my wall if I have no idea what size the piece is?
You should Definately have a better way to view your photo gallery if you are going to use HTML bassed website the light/thickbox work very well and look really professional. Also post just you best pictures and try not to have you pictures so big that they can't be viewed on smaller screen like a laptop. Those are the biggest things. good luck with it and post it when you are finished i would like to see the finshed project