A woman bought me her iPhone to print up some pictures. She started to delete some of the photos but accidentally deleted a photo she didn't want deleted. I discovered iPhone has a setup similar to having a recycle bin.
Go to your Photos.
Scroll down till you see a folder called Recently Deleted.
In there is all your deleted photos, click on the one you want to recover then click on the word Recover, in this case down in the right hand corner in blue letters. And that's it.