It's fun to shoot big things!
#1 Try flipping on the vertical axis, so the bridge goes the other way. Also, the water is in many ways more interesting than the bridge itself. It pulls the eye down too much. A higher angle or a crop might help.
#2: Nice colors, but maybe a little overexposed
#3: Gives a great sense of the magnitude. Try running a fake tilt shift.
#4: Is a great shot. Love the humanity of it. Not sure about the OOF gentleman on the far left though.
#5: I wish this one had sharper focus. Again, a great image.