I agree it's a fine image but I don't agree that the haloes are a normal effect. Look at the white haloes along the rooflines in the background. That's the giveaway. I'd back off on the clarity slider. If I really felt I had to darken the sky I'd make a selection (easy job on this one) and use the selection on a masking layer in multiply blend mode. The haloes definitely are a distraction.
Thank you all for the comments. I agree with RSL about the white halos, and will do what I can to fix them. The halo around the mosque, I felt, was what I'd expect from a severely backlit building.
The shot was actually bracketed and combined using a rather crude method. I'll play with it some more: it shouldn't be too difficult (famous last words!) to improve it. I certainly think the image merits some time and effort!
I'll report back...