I've got a suggestion for the site, but I don't know if there is already a similar feature available, if people will use it or if it is even possible to implement.

Here goes:
How about allowing you to subscribe to a specific author's work, and being notified when he/she uploads new images. I know I have some favourite author's whose work I like and would like to see when they have something new available.

Don't know if other's would find it useful though...