Make gallery3 work as seamlesly as possible with campsite structure in terms of languages, issues etc. Watermarking would be plus for this module.
Gallery should have basic features:
- albums (distribution of images to different folders)
- thumbnail/predefined standard/full resolution image display
- extended description for album & image (incl. EXIF metadata)
- comments (for both album and single image)
- rating (for both album and single image)
- RSS feed (images/description/comments)
Additionally it is usually asked to have:
- gallery search
- random image slideshow (like banner, to show on other pages/external resources)
- tags (tag cloud)
Gallery3 could be considered as a nice example of how it could be implemented.