What are the images I’m looking at? What do you want me to know? How are they related to what I want to get from you and what are you trying to say? Explain the context for the images to me. Why are they here?
Your gallery pages should be easy for me to understand. Your images should be related to each other so I don't have to spend time figuring out what the images are trying to say.
If you want to show images which don't relate directly to each other, make sure to give me a heading and a new piece of copy which describe what I'm looking at.