Thanks. I didn't jump in because there were already some great responses and image manips in answer to your request.
My version was a little late to the party and was second to your idea of extending the BG to fit and reducing the main subject (you) in the foreground. I responded to demonstrate that while you did a very good job, you have room to improve with your skills, as we all do...........myself included.
As I stated, I was trying to show that perspective is vital to selling the extension as well as maintaining consistency with texture and shading.
note: I'm skipping what has been covered by Chris.
Below, I show two places where perspective would have added to the believability of the manip.
The large arrow shows where you had the right idea, but you needed to add a gradient to sell the perspective. (next smaller arrow)
The windows are fine, but need some work.
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Keep your lines straight. And be careful when embellishing (grate), stick with simple.
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Another thing for me, the cloud change is completely unbelievable and it betrays the lighting of the rest of the image, especially the dull mist/fog/smog.
Keep up the good work and practice!
