I’m now going to describe what I think will happen next in this image. The families having a picnic will probably start wrapping up as the day goes by. It's likely that some of them might begin to pack their belongings and get ready to leave. The children playing by the lake are going to continue running around, but they might eventually head back to their parents as it gets closer to evening. I believe that the people sitting on the grass are bound to start picking up their picnic items soon, especially as the sun begins to set. I think the boats on the water might also start returning to shore as their time on the lake ends. Perhaps the entire park will gradually empty out as everyone begins to leave after enjoying a day out.