This one is a really tough one! This swimmer is clearly just out of the pool and she is not looking super happy. Maybe she has realized her swim record has been broken by a competitor. Maybe she was hoping to smash her own personal best and failed. Maybe the dude in the background has been causing trouble. He does look kind of annoying if you squint really hard! I guess we'll never really know what's going on.
Something we can know, though, is what the difference is between these two pictures. There's only one, so don't go looking for hundreds of different things at once. Take a close look at her swimsuit, small details, such as logos, as well as items in the background (like the annoying guy behind our female swimmer).