I definitely look for professionalism. I want words spelled correctly, and I want everything to look neat.
I agree that an "About Me" section is a great idea, especially for a photographer. Photography is something that can be so subjective, it's a good idea to let your potential customers know a bit about you and get a feel for who you are.
I also can't stand photography websites with limited selection of photos to view. I hate it when the photos take 100 million years to load. I dislike it when I cannot find the contact information. Links that don't work are a big no-no.
I guess my biggest thing is professionalism. So many people think the internet is a place where everything is casual, but I appreciate a well done website. :]
Can't wait to see it!
Hope this is helpful.