I personally think this should be written around an Object Oriented Architecture. As mentioned above, using some type of database abstraction layer would be incredibly beneficial.

Also to add to the list:
categories: (user can assign image to 1 or many categories)
and of course an admin area for editing it.

Has the image gallery been approved for our project?

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There are No Stupid Questions. But there a LOT of Inquisitive Idiots.