Don't worry, friend. Before recovery, you should stop inputting data into the file in case the data will be covered. As you are using Android phone, it's easy to recover pictures from it. No matter whether you have backed up your pictures, you can recover them. To carry out this recovery process, you can try Android Data Recovery, which is able to recover various files like contacts, messages, videos, etc. With this program, you can easily recover deleted pictures from your Android phone. You can refer to the guide of how to recover deleted photos from Android here:
1. Connect your phone to computer then run Android Data Recovery
2. Enable USB debugging
2. Select the files to scan
3. Recover deleted pics you want to get
It's easy to use, right? I hope it can help you.Good luck to you!