I quite like that aspect actually, because where you were standing is not completely obvious. Also, shots on flat ground tend to have far too much foreground, whereas this has a depth to it which just so happens to be quite red.
It's very evocative. The beautiful city above, with the mysterious red underglow beneath.
As for the halo thing, it's not too pronounced. What I like to do though, when using shadow/highlight is mask off the area I'm most interested in. Doing it on another layer lets you make a stack of corrections to different parts of the image, at different levels, and avoids the halo.
Can be a bit fiddly, but is much easier on almost solid colours like your sky.