good color and light balance..
from that distance theres almost no way, what you got is good !!
If you are thinking about the "compression effect" that supposedly comes with a telephoto lens:
you would just bring the citylights maybye a hair closer to the eagle, looking like its compressing it a little..
but the the relative image heights of distant objects will NOT change with lens focal length.
sorry , Its a wifes tail...
It has more to do with our field of view changing then anything else, not the length of the lens....
aside form that, yeah you could just get a bigma and a 2x extender and shoot the skyline, but the eagle would NOT be in the picture....