Oooh, this is a lovely shot! I like what you did with the color/saturation/lighting adjustments - seems very effective. I do agree with other commenters that the cropping could be different, but as it stands now the crop you chose isn't bad at all.
Personally, I don't feel that the shadows are too muddy - I think they are a nice contrast to the lighter parts of the photo and give the city buildings and the sky a nice emphasis. And the city and sky are what, in my opinion, make this photo truly lovely.
I also like the people there as it gives a nice, personal feel, but having them not in the shot would give it a different feel that might be better (or might not).
Love the composition and the location here. The tree framing the city - very nice.
Selecting the shadows and working them to bring out the details would make
this a stunning image. Right now the dark sections are muddy and lacking detail.
If you don't know, I'm referring to these techniques:
the shadow/highlight filter in CS/2, or the ctrl-alt-~ to select the highlights in earlier versions, then shift-ctr-I to select the dark sections