Very sweet! I love the integration of cgi & photo images. The only thing I can suggest is to tone down on some of the fire effects. Strong daylight, especially bright days like you've chosen, will dim even fire to produce a subdued set of colors. The smoke looks great, though I'd add more of that and less flame on some of the concrete buildings. Best thing to do is look at some actual footage of burning buildings from daylight shots. If you can, contact a local news channel and see if they have any archive footage you could view. If you explain your project and direct them to the clip, I'm sure someone would be more than willing to help out (and you might even get a job offer).