Clouding around the edge of the picture. Contrast of the black and white. The light in the back of the picture pops out more so you notice the child and the ball. Use a silhouette cut-out to make the silhouette of the child?
This GIF is very interesting, as the majority of this animation has a black and white theme, which contrasts against the very colorful umbrella. The fact that it is raining and the umbrella is hung up, not being used, is interesting.