I have a CMS-based website with the ability to add lightbox galleries to blog posts. Galleries can have one or more images and will be represented in the body of the post by a thumbnail of the first image. Click the thumbnail, see it blown up, lightbox-style with arrows and a close button and all that.
Are there preferred UX practices to indicate the following:
- This is a thumbnail that when clicked will present a larger version of this photo
- This single photo actually represents multiple photos, of which you can see larger versions if you click. OR 2A. This single photo actually represents just one photo, of which you may see a larger version if you click.