Recovering deleted pictures

I accidentally deleted some pictures off of my ATT s6. I thought it would be easy to recover the pictures, but that does not seem to be the case. My phone has 5.0.2 android with a baseband version ending in OF4. The kernel is Aug 5th 2015. Based on my research it appears that my phone is currently unrootable? And root privileges are needed by any android app to recover the pictures? I also tried a windows app Wondershare Dr. phone for android, although it doesn't seem to recognize my phone. Any solutions? I know that I am running out of time since the pictures will be gone forever if the memory if used by other files. Thanks in advance!