Great shot... seeing Tower Bridge always fills me with dread because I used to commute there... i can't help but feel it's spoiling the slick modern lines you've got going here, but there you have your extremities.
I was mostly looking at it from the river. There was a feeling of wrong shape in the wrong place, emptiness and boredom. This one is dynamic, tecchie, exciting. The exact opposite of what I saw from the boat =]