Gallery UX

Given that the main principle behind the gallery is ease of use, and some sort of flexibility and reusability, I've created three basic use scenarios that should help me write down the application. But first of all some definitions:

The image is described with:

1. a descriptive information:
   • a mandatory field title (given by default by the name of the file)
   • technique used
   • place taken
   • ...
2. a free list of tags/labels (we don't know yet if these have to be defined before hand or not)

Use cases

1. User uploads the images,