How important is **Close** button in an expanded view?

I have a situation, Where a user lands on a page full of photos of team members upon click I have to show description/content regarding the particular. But my question is, do we need to show CLOSE option? Isn't self-explanatory that user has to either click on next picture to see more in regards or click on the same user to collapse the expand.

Real scenario/behavior is exactly how Google image acts upon click, where you search for a picture and click on particular, and you see CLOSE on top right corner and rest of the images are pushed down.

How do I solve this?