I agree with Ray the site does look a bit empty now... probably good idea to reduce the container width a bit since you dont have too many contents right now, or use floating sidebars.
Also I guess it's probably a good idea to put your descriptive texts on top of the images, instead of down the bottom. Because if I were your client, i want to see what you can do or what type of services you can offer first.
Regardless how professional your site looks, remember NOT to lose your site's identity/theme along the way.
For inspirations you can go to
Best Web Gallery - Flash + CSS Gallery, got fantastic sites over there.