How To View Facebook Locked Profile Picture ?1. Open the facebook person whose profile picture is locked or is set toprivate.
2. on the profile picture and click on Copy Image Url as shown in image below.
3. Open that image in new tab by right clicking and selecting Paste (CTRL + V)
4. Now change the value of highlighted below which might be s160x160 tos720x720 (If its not clear try (s320x320)