a great start - generally a nice look
however - this is a commercial web site - the first thing the "customer" should see is contact information right up front - not buried in a menu - you should have the client's phone number, address, email posted clearly on the very first page the "customer" sees. this is a MUST.
on the picture transitions - they are to "busy" just go directly to the next image, not disolve, fade etc.. unnecessary
on the "darken pictures" that you rollover to see - these are terrible - they make your client seem like he takes pictures that are to dark! yeech.. get rid of the rollover stuff and show off his work!!
the site should be about his work, not about web site effects and programming..consider getting rid of the popup window insert as well.
these are my personal opinions - in general, i believe the site is very professional in appearance - general format is sleek and attractive - it is just that i have done/pondered a business website layout, and you have to aim the website at the customer base, present some basic information (who, what where and when) about the company right up front, and remember that most people will not "cruise" around a web site - they look at the first page or two and leave if they are not immediately captivated. also a business site is a litttle different than others.