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Nice composition....I look forward to the day when the freedom tower no longer has a crane atop it. I just got back from 3 weeks in NYC, but worked so much that I only had one walk around day with my camera. Your photos are making me wish I had stayed a day or two longer.
Along with the comments above, also watch for sensor dirt or perceived sensor dirt in the skyline (when photos are sized down, aircraft and birds can start to look like dirt.)
Check your horizons too. I am feeling a slight rightward lean to the buildings in both pictures.