Here is an example. I uploaded a picture that was shown here http://jollyshot.com/Kzg7Xe where you can see that "This photo has expired!" but the image is still accessible here http://jollyshot.s3.amazonaws.com/media/5e34cc07d5fc6b390c1d...
1) Next to the View Count ("3 Views") impliment a feature that keeps track of the number of different IPs that generate those views ("by 2 People"). This is important because it lets you know how many other people have seen the image, not just how many times the page has been reloaded.
2) Make it so users can drag and drop an image into whatever page they're on. Even if it's the user page, front page, photo page. Don't make me have to go back to the home page.
3) Instead of calling it JollyShot.com you should grab TempShot.com before anyone else does. I think the new name would fit better with the service.
But... converting PNGs to JPGs makes it unusable for many many use cases.
I share screenshots all the time and it really needs to be done with .png's for the clear image and text.