Example:
I go to see someone's pictures in their gallery. I see an album which has 10 pictures in it.
I click and see the first one. Then I would like to see the next one, but I must go back to the album and select another one.

Solution:
There could be a buttons called "Next" and "Previous" above the picture I'm currently watching.

Couldn't find this kind of topic and lmk your arguments if you are against this small change.