For some reason, Yahoo does not appear to have accepted my image loads, and will not allow me to create a new album for the images at this time.
As an alternative that can be seen by anyone, I created a new project page at Weavolution called "Photographing Yardage." Unlike Ravelry, you don't have to be a member to access this project page.
Bonnie's advice to reference SS&D for past images is sound. Also note photo credits are typically given. So if you see a photographer whose image you like, you might contact them for professional help if you feel it's too difficult to try on your own.
If you are thinking to hire a professional, it would be worth your time to play with your yardage first — practice styling it. If you know what you are asking your professional to capture before you get into the studio, it might save time and money.
Good luck - I can't wait to see what will be juried into all the exhibits this summer.