This is an activity you can adapt depending on the skills or level of your students. The first step would be to describe both pictures separatedly. I usually prefer doing it as an oral task. Then the students compare the images and write about the differences and similarities between them. As homework or third task in the classroom, students may make up a story taking into account the starting point given above (the wedding). Enjoy it!
We practice here adjectives, physical appearance, clothes, and comparative structures. So you can use my worksheet "From Tip to Toe" where you'll find many useful vocabulary related to the topic: