How do I write a posed caption in a yearbook?

Yeah yeah, yearbooks aren't supposed to have posed pictures but this one is really cute. It's of three little girls smiling. I'm supposed to write a caption for every pictures but I'm not sure what to do here.How do I write a posed caption in a yearbook?
Just say who they are and where they are, and what they were doing before and after the picture, like ';Having fun at the pool'; or ';Enjoying the homecoming dance';