How to get deleted pictures back?

My friend deleted some pictures of my iPhone and I was wondering of I could get them back? I haven't updated my phone in forever do its not backed up to a computer. And I haven't got it backed up to iCloud:/ I have an iPhone 4S

Connect iPhone to computer, and then open "Computer", iPhone should show as a drive letter there. If not, please follow these instructions: In iTunes, right click on your iPhone and select "iPhone Options". Under the "iPhone" tab, make a tick in "Enable Disk Use". Click OK. Unplug your iPhone, then replug.

Now follow steps below
Step1: Download the latest version of this Photo Recovery software, then install and launch it in Windows machine correctly.
http://www.001-software.com/picture-recovery/
Step2: Sync your iPhone with computer. Then you should see it shows as a drive letter in 'My Computer' like H:/.
Step3: Select iPhone drive letter and then click "Next", you will find all your lost files in the lists.
Step4: After the automatic scanning, it's time to finish all the steps by clicking "Recover" easily to Recover your files!