Tables for tagging are stubbed out, but need support for adding/editing tags to items in the catalog and an ability to search/view those tags.

CSS work - see if the css will allow for dynamic build of the table instead of forcing 5 cells wide

Image from URL needs to be moved into a function instead of it's own routine. Also add in some better error checking and gracefully error out if an invalid type is attempted to be used.

This may be useful if one wants to track how much their collection cost.

Wish list item - Ability to select a primary image from the uploaded images or even an image rotation of all the images.

To make multiuser support, try using oauth support for some of the bigger authentication services, like google:
https://codeshack.io/implement-google-login-php/

dbfunc/image.php - figure out why this cannot be in the same format as the other DB calls and remove the extra password entry.

Add in a rating system to rate the items. Perhaps show the top rated on the main page.

Currently the system support png, gif, and jpg. Other types would be nice, such as webp.