"Anything You Can Do, We Can Do Better"
Use small amounts of text to give the images context - Your images should speak for themselves, but don't risk me being confused.
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.
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.