The ISO 100 and f/1.8 setting decisions kind of hurt this shot. A little bit more depth of field would have added to the feeling of "real-ness" by getting all of their heads in focus. As it is there are lots of out of focus areas. For these kind of kid candids using ISO 320 or 400 makes more sense than running at BASE ISO on grab-shot rich opportunities like this. f/1.8 is simply not the right aperture when there are two (unpredictable and little) people in close-in compositions like this. One person, okay, you can get away with it...but with two people, at that close a range, electing to go wide-open with a telephoto AND running at ISO 100 is not the best strategy for getting the pictures when you often are going to have 1,2,maybe 3 seconds to get the whole shot, start to finish. Make no mistake--it is a cute moment. But it has a lot of OOF areas that could easily have been avoided. If the lens would have been at f/4, this would be much stronger.