Move all photos from phone to PC: easy method
The simplest method would be to connect the phone to the computer then enable PTP (pictures transfer protocol) on the phone instead of MTP. 

On Windows, a dialog usually pops up just choose Import images and videos. Alternatively  you can  right-click on the phone icon in Computer and select Import images and videos. 

The computer then retrieve ALL photos and videos inside the phone and copy them to a folder in the computer. 

This article provide further informations about android USB connections.