Make sure that the Enable Microminimus Unlocked sitewide is active on your Profile settings to view unlocked pictures. It's in Settings under Profile, check the tick-box Enable Microminimus Unlocked sitewide.

When viewing galleries the Unlocked icon/indicator is on the top right-hand corner of the page- in a gallery with an Unlocked image.

Despite the Unlocked Icon/Indicator being hidden, the Unlocked Photos in each gallery are still available for viewing. That means to view Unlocked Photos, a member should browse through the gallery in order to view them.