Use small amounts of text to give your images context - your gallery pages should be very easy for me to understand. Images on these pages should be related to each other so I don't have to spend time figuring out what the images are trying to say.
"Keep testimonials short, consice, and attributed to someone."
- John Van Doe
Duis commodo neque nunc, at porttitor neque tincidunt at. Quisque et eleifend libero, quis gravida turpis. Aliquam erat volutpat.