The Jewish marriage ceremony is held under a chuppah (canopy). Then, immediately after the ceremony the bride and groom go into the yichud (seclusion) room to complete the ceremony. Since it is forbidden for an unmarried couple to be alone, the yichud room shows that this couple is now married.
This groom is maybe 18 years-old and his bride a year or two younger. That is one of their mothers who is about to leave and then they will lock the door to be secluded for the first time.
What do you imagine is going on in their heads? What will be there first words to each other? Some have the custom first for the groom to ask Hashem to bless his bride, and then the bride asks Hashem to bless her groom. This is the beginning of their life together.
An amazing moment in life.