That sucks it was able to retrieve all my pictures. At least your better off than this other guy who decided to root and flash his mom's phone without backing anything up, and lost everyone of her photos, which was in the hundreds.
I now have my phone, tablet, dslr, and PC all setup to sync my pictures with Dropbox immediately after being taken. Any photo taken with any of those devices automatically uploads it to Dropbox, and makes it available to all the other devices. I then use "folder sync" to automatically sync it to a local folder on each of my devices, so it will show up in my gallery.
I pics that I retrieved with "dumpster" were actually lost when trying to set up this backup system. But now all my devices (plus Dropbox) are my backups for one another.
If you really want to try to retrieve the pictures I'm probably sure it's still possible. I used to work as a computer tech and there is more advanced software to recover lost and deleted files for professional technicians. It'll be expensive though, over $100 for either the software or service to do it for you, but if you really want the pics back you may want to look into it.