Composition is nice. Execution-wise either the child or the back ground needs to be dominant. I think with the hazy day, a fill flash to bring out the child would be the best choice. Meets the challenge.
Challenge contradiction - subject is the baby, with the city as an incedental background. Subject is heavily shadowed, but the focus is pretty good. Very hazy cityscape. 5 Swash
I'm sure you were going for this look, but still, I'd like to see a little more detail on the subject's face. This could also give the image a little more color. Either that, or maybe the focus set on the city and the child's face out of focus.