Create your own gallery.
When you create it, you give it a name... such as "Qwirz's Gallery" or "Fantasy Photos." You can even upload a photo.
Once you have created your first gallery, you may make others referred to as sub categories. For example, you can have a gallery for Pulp miniatures. Another for Sci Fi photos, or terrain. For each sub-gallery you can upload a photo to reinforce what kinda stuff is in the gallery.
Once you place a photo in the gallery, you can also use it as a host to post photos on the forum.
Take a look at my gallery:
https://leadadventureforum.com/index.php?action=gallery;su=user;u=1615Notice at the very bottom under "Gallery Admin Panel" you can "add category." This would be another sub category for your gallery.
Some folks have their stuff divided into sub categories, while others just have a single gallery which they add all their photos in.
It's up to you.
Good luck!