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, to the point, directly related to the rest of the page content and always attributable to someone."
- John Van Doe
If you want to show images which aren’t related, group each set of photos under a unique, descriptive heading with copy that tells me what I’m looking at.
Make sure to give me a heading with associated copy which describes what I'm looking at