Both of these pictures have different spacial hierarchy. The first one has a shallow depth of field, so we draw our attention to the little girl and the birds, and don't pay much attention to what is in the background. This isolates the girl from everything else . The second picture has a less hierarchical emphasis due to the increase in depth of field. This picture still has many levels though, and our attention diminishes as we look past the boats ( and the sharpness drops off). This plane of focus grabs our attention to the boats/