In these days Facebook has become most popular for Social networks. It gone to over 1000 million users from worldwide and stands for the top 2nd most visited website in world.
Due to more privacy from users Facebook are unable to apply codes on them.
Step 1 : Go to the profile of which you want to unlock the image.
Step 2 : Copy the link location of the image and paste in text editor.
Step 3 : Remove some of the code where it says p160x160 and place url in the address box to hit enter.
The url becomes like this.