You should automate the process of adding new puzzles, instead of manually adding them everytime.
Why not code up a queue (and put a set of puzzles in it) so that once someone has solved the picture, or the picture has expired, it automatically publishes the next puzzle for you?
Yeap I want to do that too actually.
Here's something different:

No hint this time! Could be item/person/title or even anything else.
Wow, no clue on this one. Maybe a screw or something? I could convince myself I see threads...
Btw, where are you pulling these images from? Your own personal collection or from around the web?
Either my own photos or screenshots from movies TV series etc. Generally it's not stuff that you can google image search. :-)
Would it be unfair if I put a hint on this one now? Given that some people have already answered I mean. I would say that it wouldn't, since all people would be helped by it but at the same time, people who saw the "No hint!!!" are less likely to look at the hint box again so they might miss it. But I'd really like to help a bit more... :-( Maybe I can put it an add an alert to notify all players of the new hint.
[EDIT] OK I did that. So everyone will be aware of the hint now.